PRINCIPLES OF PICKLING
86. PICKLING consists in preserving fruits and vegetables in vinegar or brine. Each of these liquids acts as a preservative, so that the receptacles, or containers, for the food do not have to be sealed air-tight, nor does the preserved food require much care in order to have it keep perfectly.
The effect of the pickling liquids on both fruits and vegetables is very similar. The salt in the brine or the vinegar hardens the cellulose of the foods to such an extent that they are impervious to the action of bacteria. While this permits the foods to keep well, it also makes them difficult to digest, a fact that must be remembered when pickled foods are included in the diet.
87. The procedure in pickling is simple. After the fruit or vegetable is cleaned and prepared in the way desired, it is merely a matter of placing the food in sterilized jars or crocks, pouring the hot preserving liquid over it, allowing it to cool, and then storing it. In some cases the food is cooked, and in others it is not. As a rule, spices of some kind or other are added, both to aid in preserving and to impart flavor.
88. Practically all large fruits and many vegetables are pickled, as is shown in the recipes that follow. Foods preserved by pickling are known as either pickles or relishes. While both products are similar in many respects, relishes are distinguished from pickles in that, as a rule, they are made up from more than one kind of fruit or vegetable and usually the pieces are cut or chopped and not put up whole. Often the foods in relishes are chopped or cut so fine as to make it almost impossible to tell what the fruit or vegetable was originally.
The food value of both these products is not extremely high, unless a great quantity of sugar is used in the pickling. This is sometimes the case with pickled peaches or pears, but seldom if ever with pickled vegetables.