D2C and FMCG brand owners
Launching a shelf-stable range, or moving an existing frozen or chilled SKU to ambient so it can be sold online and shipped without a cold chain.
Retort category
Sauces, gravies and condiments
Shelf-stable table sauces, cooking gravy bases, chutneys and dressings — ambient condiments that hold their viscosity, colour and flavour through a full thermal process. We establish whether your recipe is low-acid or acidified, build the scheduled process around it, and hand you the documentation a co-packer can run from.
What we develop
Sauces, Gravies & Condiments we take through the pilot
If it is a packaged product that needs to sit on an ambient shelf, it is a candidate for retort processing. Formulation and packaging are assessed for compatibility with thermal sterilization before any run, at our pilot retort unit in Chennai, India — and every product gets its own scheduled process rather than a borrowed one.
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Table Sauces and Ketchup
Tomato, chilli, barbecue and speciality table sauces, held at the viscosity and gloss the pack promises.
Develop a table sauce -
Cooking Gravy Bases
Onion-tomato, makhani, korma and curry bases sold to manufacturers and kitchens as a ready base.
Develop a gravy base -
Masala Pastes and Marinades
Concentrated spice pastes, tandoori and tikka marinades, and wet rubs built for ambient distribution.
Develop a masala paste -
Chutneys and Relishes
Mint, tamarind, mango and mixed-vegetable chutneys, where particulate texture is the product.
Develop a chutney -
Pasta and Pizza Sauces
Tomato, arrabbiata, pesto-style and white sauces for retail and foodservice.
Develop a pasta sauce -
Dips, Dressings and Spreads
Emulsified dressings, savoury dips and spreads that have to stay together on an ambient shelf.
Develop a dip or dressing
Why a pilot first
Where sauces and gravies fail in a retort
These are the failures a pilot run is designed to surface — each of them cheap to find in twenty pouches and expensive to find in five thousand.
- Viscosity breaks down Native starch loses its structure under sustained heat. A sauce that coated a spoon at fill runs thin in the pack.
- Emulsion separates Oil-in-water dressings and rich gravies split, leaving a layer at the top that reads as a defect on shelf.
- Colour darkens Tomato lycopene, turmeric and chilli shift under heat, and browning reactions push the sauce toward brown.
- Aroma flattens Volatile top notes from fresh herbs and whole spices drive off during the cycle, leaving the sauce tasting cooked.
- Particulates soften Onion, garlic and vegetable pieces in a chunky sauce lose their bite and blend into the base.
- Pack interaction Acidic sauces attack an unlacquered can and can pick up metallic notes, or migrate into an unsuitable film.
None of these show up in a kitchen trial. They show up in a retort.
What we change
The levers we pull to make it survive the cycle
Reformulating for retort is not about weakening the product. It is about choosing ingredients and ratios that arrive at the right result after the heat, rather than before it.
- AcidificationMany sauces sit naturally near pH 4.6. Bringing them below it moves the product from a full sterilization process to a much milder one.
- Retort-stable starchCross-linked and modified starches hold viscosity where native starch would break down under the cycle.
- Hydrocolloid systemGums and stabilisers chosen for heat and acid tolerance, so the sauce stays uniform from fill to shelf.
- Spice addition pointHeat-labile aroma is dosed where it survives, and heat-stable base notes carry the flavour through the cycle.
- Particulate size and loadCapped so the chunky character survives without slowing heat penetration past the point of usefulness.
- Pack and lacquer matchAcid level, salt and pack material assessed together, so the sauce does not fight its own container.
Packaging
Formats it can ship in
Pack formats we run
- Retort pouchFlat or stand-up, up to 150 × 200 mm — Fast heat penetration and the lightest format to ship
- Glass jarTwist-off and lug closures — The default for table sauces and chutneys, with shelf presence
- CanTinplate and aluminium, lacquered — Robust for acidic products where the lacquer is matched
- Semi-rigid tubPP with sealed lidding film — Foodservice gravy bases and bulk condiment packs
Heat penetration and seal integrity studies settle which pack suits your specific product. We also run packaging material testing on its own, for converters validating a retortable film, tray or closure.
What we need from you
- Fill weight and drained weight
- What goes in the pack, and what the consumer sees when it comes out
- Solid-to-liquid ratio
- The single biggest driver of heat penetration in a filled pack
- Largest particulate dimension
- Decides where the cold spot sits and how long the hold runs
- Target pH
- Determines whether the product is low-acid or acidified
- Viscosity, hot and cold
- Governs whether heat moves by convection or conduction
- Target shelf life and market
- Sets the validation and documentation the project has to produce
Already developed
Retort products we have taken all the way
These started as the same conversation. Each one went through the pilot, came out with a validated scheduled process, and is now a ready-to-use base that manufacturers, restaurant chains and cloud kitchens buy by the batch.
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Tomato Gravy Base
A ready-to-use retort gravy base for manufacturers, restaurant chains and cloud kitchens — commercial sterility and ambient shelf life without artificial preservatives.
View product -
Onion Tomato Masala
A ready-to-use retort curry base carrying the character of a slow-cooked masala into a shelf-stable, consistent format for volume kitchens.
View product
Who we develop for
Brands, manufacturers and exporters
Sauces, Gravies & Condiments are developed here for the people who have to put them on a shelf — from first formulation through to a process a manufacturer can run. The same product is called a cooking sauce, a cook-in sauce or an ambient sauce in the United Kingdom, a culinary base, food base or simmer sauce in the United States, and a gravy base or masala base in India. We develop for all three markets, including catering sauce and foodservice formats for commissary and central kitchen supply.
Food start-ups and entrepreneurs
A recipe that works at home or in a cloud kitchen, and no idea whether it survives thermal processing at all.
Exporters and importers
Ambient meals for diaspora and overseas retail markets, needing a validated scheduled process and the documentation an importing authority will ask to see.
Cloud kitchens, QSR and HORECA
Turning a menu item into a packaged product, so a dish that sells in one kitchen can be produced centrally and shipped ambient.
Private label and contract manufacturing buyers
Sourcing a white-label or private-label product, and needing the formulation and the process proven before committing a co-packer.
NPD, R&D and QA teams
Inside an established manufacturer, needing pilot capacity and thermal process expertise without tying up a commercial line.
The technical side
Thermal processing, in the terms your QA team will use
If you are briefing an R&D, NPD or quality assurance team, these are the concepts a retort sauce and gravy project is actually built on. They are also the terms an importer, an auditor or a co-manufacturer will expect to see in your file.
Process and science
- Commercial sterility
- The state a low-acid product has to reach: no microorganisms capable of growing under normal ambient storage. It is a process outcome, not an ingredient.
- F₀ — sterilization value
- Integrated process lethality, expressed as equivalent minutes at 121.1 °C (250 °F) using the z-value of 10 °C (18 °F) conventionally assumed for Clostridium botulinum spores. For process establishment it is evaluated at the slowest-heating point of the container. The number your scheduled process is built around.
- D-value and z-value
- How fast a target organism dies at a given temperature, and how that death rate changes with temperature. Together they turn a time–temperature curve into a lethality figure.
- Clostridium botulinum
- The target organism for low-acid canned foods. Every low-acid ready-meal process is designed against it, which is why a curry is treated differently from an acidified sauce.
- Cold spot
- The slowest-heating point inside the container — usually the centre of the largest particulate rather than the sauce around it.
- Come-up time
- How long the retort takes to reach hold temperature. Product keeps changing throughout it, which is why the state at fill and the state on the shelf are different targets.
- Low-acid versus acidified
- Above pH 4.6 a product is low-acid and needs a full sterilization process. Acidifying below it, where the recipe allows, moves the product to a milder process.
- Overpressure
- Compressed air applied on top of the process medium so pouches, semi-rigid trays and glass do not burst as entrapped headspace air expands and product vapour pressure rises. Rigid metal cans in saturated-steam still retorts generally do not need it; the same cans in water immersion, steam-air or rotary systems often do.
- Static and agitating retorts
- Static retorts hold the pack still. Agitation — end-over-end, axial or reciprocating — moves the contents and speeds heat transfer in products that heat by convection, where a mobile liquid phase and a headspace bubble can travel as the container turns. It does little for a solid pack that heats by conduction. Rotational speed is itself a critical factor in the scheduled process.
- Water immersion, steam-air and spray
- The three common heating media. Each transfers heat differently, so a schedule validated in one is not automatically valid in another.
- Water activity (aw)
- Free water available to microorganisms. 21 CFR 113.3 defines a low-acid food as one with finished equilibrium pH greater than 4.6 and aw greater than 0.85, so a product at or below 0.85 sits outside Part 113. Above both thresholds the product needs a scheduled process delivering commercial sterility — which can be reached by heat, by acidification under Part 114, or by controlling water activity combined with heat.
- Scheduled process
- The validated combination of time, temperature, pressure and fill that delivers commercial sterility for one specific product in one specific pack.
- Temperature distribution study
- Mapping the retort itself before the product goes in — finding the slowest-heating position in the vessel across a full load. It is a separate study from heat penetration, and it comes first.
- Heat penetration study
- Thermocouples placed at the cold spot of the pack, through a full cycle, in the slowest-heating position the distribution study identified. This is what the scheduled process is calculated from.
- Incubation testing
- Finished packs held at elevated temperature for a set period and then examined for swelling, pH shift and spoilage — the check that the process actually delivered commercial sterility. 21 CFR 113 defines incubation but does not mandate it; US canned meat and poultry must be incubated under 9 CFR 431.10 at 95 ± 5 °F for not less than 10 days.
- Challenge testing
- Deliberately inoculating product with a target or surrogate organism to prove the process controls it. Used when the formulation sits near a critical limit rather than comfortably inside it.
- Process deviation
- A cycle that ran short, cool or interrupted. The batch is not automatically lost — but the deviation has to be evaluated against the scheduled process and the decision documented before it can be released.
Standards and compliance
- FSSAIIndian licensing, product standards and labelling for packaged foods
- Codex AlimentariusThe international reference code of practice for low-acid and acidified canned foods
- HACCP and GMPThe food safety management and manufacturing systems the process sits inside
- US 21 CFR 113 and 114Thermally processed low-acid and acidified foods, for exporters shipping to the United States
- EU and UK requirementsFood information and labelling rules, and the documentation an importer will request
- Nutrition and labellingNutritional analysis, allergen declarations and the claims the pack can legally carry
- ISO 22000 and FSSC 22000Food safety management certification, and the scheme an international buyer or retailer will usually ask to see
- US FDA registration and process filingFood Canning Establishment (FCE) registration on Form FDA 2541, then process filing on Form 2541d (low-acid retorted), 2541e (acidified), 2541f (water activity or formulation control) or 2541g (low-acid aseptic), each carrying a Submission Identifier (SID) — required under 21 CFR 108.25 and 108.35 before low-acid or acidified product enters the United States, with process control to 21 CFR 113 and 114
- APEDA registrationExport registration for scheduled products, alongside the health and phytosanitary certificates a destination market asks for
- Halal and KosherCertification routes where the destination market or the buyer requires them
Thermal sterilization is only half the work. The other half is the documentation — the scheduled process, the heat penetration data, the microbiological results and the shelf-life study — that lets a manufacturer run the product and an authority clear it.
Questions
Sauces, Gravies & Condiments, specifically
Is a tomato sauce low-acid or acidified?
It depends on the finished pH, not the ingredient list. Above pH 4.6 the sauce is low-acid and needs a full sterilization process; brought below it and held there reliably, it becomes an acidified food on a much milder schedule. Establishing and controlling that number is one of the first things a pilot settles.
Can a chutney keep its texture through a retort?
Partly. Some softening is unavoidable, so the formulation is built to finish at the right texture rather than start there — cut size, pre-treatment and pectin or hydrocolloid choice all shift where it lands.
Should we hot-fill instead of retorting?
For a reliably acidified sauce in a suitable pack, hot-fill is often the better route and we will say so. Retort earns its place when the product is low-acid, particulate-heavy, or needs a shelf life and distribution that hot-fill cannot support.
Why did our sauce go darker after processing?
Usually Maillard browning and pigment degradation together. Reducing reducing sugars, adjusting the hold, changing the pack or shifting the spice profile all help — which one applies is what the trials establish.
How long does a pilot take?
Typically three to eight weeks from first consultation to a validated pilot batch, depending on how much reformulation the product needs and whether shelf-life work is included.
What batch size do you run?
Our pilot retort takes 6 kg per cycle, roughly 20 pouches at 300 g. That is enough to answer whether the product survives the process across several pack formats, run a sensory panel and pull shelf-life samples.
Do you offer contract manufacturing or private label?
Our retort is a pilot and development unit, not a commercial line. We prove the product and the process, then hand the validated scheduled process and documentation to a co-packer, co-manufacturer or toll manufacturer — ours or yours — for private-label or white-label production at volume.
Can you supply on a private label or contract manufacturing basis?
Our retort in Chennai is a pilot and development unit rather than a commercial line. We prove the product and the process, then transfer the validated scheduled process and documentation for production at volume — private label, white label, own label, OEM, third party manufacturing, toll manufacturing, co-packing or co-manufacturing, with your co-packer or one we introduce. Bulk supply arrangements, pack formats and minimum order quantities are agreed with the manufacturing partner rather than set by us.
What does an export file need?
It depends on the destination. The United States regulates thermally processed low-acid foods under 21 CFR 113 and acidified foods under 21 CFR 114, with an establishment registration and a scheduled process filed with the USFDA; the European Union applies food information and labelling under Regulation (EU) 1169/2011, with EFSA governing claims; India works to FSSAI licensing and product standards. We produce the scheduled process, heat penetration data, shelf life testing results and the certificate of analysis that sit underneath all three.
More on the process, the machine and the full category list on the pilot retort processing page
Related retort categories:
Next step
Tell us what you are trying to make shelf-stable
Send the product, the pack you have in mind and the market you are selling into. We will tell you what the retort is likely to do to it, what would need to change, and what the pilot would need to cover — through to the scale-up and technology transfer a co-packer, co-manufacturer or your own plant would need to take it to volume.
- 1Send the formulationEven a bench-scale recipe and a photo is enough to start.
- 2We come back within two working daysWith what the cycle will do to it and where the risk sits.
- 3You get a scoped quotePriced on the work the product actually needs.
Let’s create something Innovative and Delicious together
Food Research Lab strives for excellence in new Food, Beverage and Nutraceutical Product Research and Development by offering cutting edge scientific analysis and expertise.
