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Tomato preserves, also known as tomato jam, are made by cooking diced tomatoes with sugar, pectin, and acid. The type of tomato used, as well as the balance of pectin, acid, and sugar, are important for a firm set. Sterilization is required for storage, and recipes can be modified for different flavors.
Tomato preserves are diced tomatoes that have been cooked with sugar, pectin, and an acid such as lime juice. Tomatoes are traditionally placed in sterile jars so they can be stored for up to a year. Another name for tomato preserves is tomato jam. The resulting product is a jelly-like batch of tomatoes with a flavor that is both sweet and salty. The quality, variety and preparation of tomatoes can make a big difference in the finished preserves.
When making tomato preserves, one of the most important aspects is the type of tomato that is used. Freshly picked tomatoes of any variety are best, but store-bought Roma tomatoes are also good, due to their low water content. Using colorful tomatoes or heirloom tomatoes can help create an interesting look and tarter taste. Cherry or grape tomatoes can help make a slightly sweeter jam.
Most recipes for tomato preserves call for the tomatoes to be peeled. Some recipes, especially those aiming for a saltier jam, prefer to leave the peel intact. Tomatoes, however, need to have most of their moisture removed by coring and planting. For large, commercially produced tomatoes, this process should leave just a bunch of tomato flesh.
For tomato preserves to grow firmly and set properly, it’s important to find the right balance of pectin, acid, and sugar. The acid for canning could be lime juice, lemon juice, or vinegar. Pectin is a thickening agent that is extracted from fruits such as apples. All three elements combine when boiled to form a type of jelly. If the proportions are not correct, the tomato preserves will not set when cooled.
If tomato canning is going to be stored for storage, sterilization of all canning equipment is required. This usually means submerging the jars, lids, and anything else that will be used in the canning process in boiling water for at least 15 minutes. This will help prevent bacteria from entering the jars and spoiling the preserves before they can be consumed.
The basic recipe for tomato preserves can be modified to create jams with different uses. Using vinegar and red pepper flakes can make a kind of sweet and savory ketchup. Adding ginger, cinnamon, and cloves can give preserves a unique flavor that goes well with cheese. Cinnamon, star anise, and coriander make for another combination that can bring out the distinct flavor of tomatoes in preserves.
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