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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.
Citric acid and vinegar are acidic substances that can be used as food additives. Neither citric acid nor vinegar has much inherent nutritional value -- both are virtually free of calories, proteins, fats, carbohydrates or fiber.Consult your doctor before you make any significant changes to your dietary habits.itric acid is typically used as an additive in processed foods, and is not commonly sold as a condiment or food additive for consumer use. Vinegar, by contrast, can be found for sale in the supermarket aisle, or on the table in restaurants and cafes.