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Cowichan Community Kitchens

Preserving tomatoes for sauce, paste and whole jars

A summer glut of tomatoes can become a useful pantry reserve rather than a race to use everything before it softens. With a little preparation, ripe fruit can be turned into smooth pasta sauce, concentrated tomato paste or whole canned tomatoes for soups, casseroles and shakshuka.

For Australian home cooks, the best approach depends on the tomato variety, available equipment and intended use. A community kitchen can make the work easier by sharing large pots, food mills, preserving jars and the cost of bulk produce, while the finished jars provide affordable flavour well beyond tomato season.

Choose sound tomatoes at the right stage

Use ripe, firm tomatoes with strong colour and no mould, deep cracks or bruising. Roma, Oxheart and other meaty varieties produce thicker sauce, while juicy salad tomatoes are excellent for crushed or whole tomatoes but need longer cooking. A mixed batch is fine if damaged sections are removed generously.

Farmers’ markets in Melbourne, Adelaide and Brisbane often offer seconds at a lower price near the end of the morning. Supermarket trays can also work, especially when tomatoes are bought in bulk during a warm-weather promotion. The community sponsors supporting shared food projects show how pooled resources can make preservation more accessible.

Prepare jars and ingredients safely

Wash jars, lids and utensils thoroughly, then keep jars hot until filling. Use jars designed for preserving, rather than recycled jars with damaged rims or ordinary screw-top containers. Check current Australian food-safety guidance and follow a tested recipe for the exact product, jar size and processing method.

Tomatoes are borderline in acidity, so add bottled lemon juice or citric acid according to a reliable preserving recipe. Do not reduce the acid, add extra vegetables or shorten the processing time casually. A boiling-water canner is suitable for many plain tomato products when the recipe has been tested, while a pressure canner may be needed for low-acid mixtures containing meat, beans or substantial vegetables.

Cook a versatile tomato sauce

For sauce, score the tomatoes, blanch them briefly, then slip off the skins. Remove the cores and simmer the flesh with onion, garlic, herbs or chilli until it has reduced to the desired thickness. An immersion blender creates a smooth texture, while a food mill removes seeds and tough skin without excessive blending.

Keep the flavour adaptable by avoiding too much seasoning in the preserved batch. Basil, oregano and extra olive oil can be added when the sauce is opened for pizza, pasta or baked vegetables. Leave appropriate headspace, wipe jar rims carefully and process using the time specified by a tested recipe.

Turn excess sauce into tomato paste

Tomato paste requires patience because much of its water must evaporate. Spread strained tomato purée in a wide roasting tray and cook it slowly in a low oven, stirring regularly, or reduce it in a heavy pot over gentle heat. The wide surface allows moisture to escape and helps prevent scorching.

The paste is ready when it is dense, glossy and holds a ridge when dragged with a spoon. Freeze small portions in ice-cube trays if you want a simple option, or preserve it only by following a tested canning method designed for concentrated tomato products. Small portions are practical for curries, sausage casseroles and a quick Australian-style barbecue relish.

Preserve whole tomatoes for flexible meals

Whole tomatoes are useful when you want texture later. Dip clean tomatoes in boiling water until the skins split, cool them briefly, peel them and pack them into hot jars. Add bottled lemon juice or citric acid as directed, then cover with their own juice or hot water while leaving the recommended headspace.

Avoid packing tomatoes too tightly, as trapped air can affect quality. After processing, let jars cool undisturbed, check that each lid has sealed, label the contents and date, and store them in a cool, dark cupboard. In warmer areas such as Darwin or regional Queensland, choose the coolest stable storage space and inspect jars regularly for leaks, bulging lids or unusual odours.

Make preserving a shared kitchen activity

Large-batch cooking is safer and more enjoyable when jobs are divided. One person can wash and sort fruit, another can prepare jars, while others stir sauce, record weights and clean equipment. Shared meals also give everyone a chance to taste a fresh batch before deciding how much seasoning to use next time.

That social rhythm reflects the value described in shared Sunday suppers, where cooking becomes a way to build connection as well as provide food. A cob oven or outdoor cooking area can also handle bread, roasted vegetables or a simple meal while the preserving pots are working.

Plan quantities, labels and storage

Before buying produce, decide how many jars your household can use within a year. Record the starting weight of tomatoes, final number of jars and any changes to flavour or texture. Label every jar with the product, date and ingredients, particularly if chilli, garlic or other additions are included.

Useful habits for a communal tomato-preserving day include:

Community fundraising can help cover produce, fuel, jars and replacement equipment; practical fundraising ideas can support a session without placing the whole cost on participants. Any jar that fails to seal should be refrigerated promptly and used within the period recommended by the recipe.

A well-planned batch turns seasonal tomatoes into several useful ingredients: sauce for pizza night, paste for a midweek stew and whole fruit for winter cooking. Start with a small batch using a tested Australian preserving method, prepare the jars and ingredients in advance, and set aside one morning to process the tomatoes safely.