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Vinegar is used to preserve a wide variety of vegetables and fruits, along with meats, fish and eggs. Preserving food with vinegar is called pickling. A short list of foods â¦ that are commonly pickled would include pigs' feet, herring, beets, cucumbers, onions, olives, peppers, peaches, pears, and watermelon rind.o preserve food the pioneers used salt, and vinegar and they could have sun dried the food and they might have had root cellars to keep the preserved food edible and cool.
Acid foods are foods that contain enough acid to have a pH of 4.6 or lower. Acidic foods can be processed safely in a boiling water canner, usually without added acid (lemon juice, vinegar or citric acid).This is necessary to control botulinum bacteria.oods can be acid because they are: 1  naturally acid foods. 2  foods that have acid, such as vinegar or lemon juice, added. 3  fermented foods, such as sauerkraut. 4  During the fermentation process bacteria produce an acid.