_Home Freezing of Fruits and Vegetables_, U.S. Department of Agriculture H&G Bul. No. 10, on sale by Superintendent of Documents, U.S. Government Printing Office, Washington, D.C. 20402. 75¢.
_by Catharine C. Sigman and Kirby Hayes_[13]
Changing fruit into a variety of products such as jellies, jams, marmalades, and preserves can be most rewarding. These products serve as a good way to use fruit that is not completely suitable for canning or freezing, while adding variety and economy to the home food preservation plan.
Jams, jellies, and preserves are similar in that they are preserved using sugar, and all are jellied or partially jellied. Each differs from the other due to the fruit used, ratio of ingredients, and methods of preparation.
Jelly is made using fruit juice. It is clear and firm enough to hold its shape when removed from the jar.
Jam is made from crushed or macerated fruit. Less firm than jelly, it spreads more easily.
Conserves are jams made from a mixture of fruits including citrus. Sometimes nuts and raisins are added.
Preserves are whole fruits or large pieces of fruit in a sirup that varies in thickness.
Marmalades are usually made from pulpy fruits, with skin and pulp suspended in a clear, jellied liquid. For citrus marmalades, the peel is sliced very thin.
Butters are made by cooking fruit pulp with sugar to a thick consistency which spreads easily.
Jellied fruit products need a balanced ratio of fruit, acid, pectin, and sugar for best results.
Fruit provides the characteristic color and flavor, and furnishes at least part of the pectin and acid that combines with added sugar to give the desired gel. Full flavored fruits are needed to offset the dilution of flavor by the large proportion of sugar used.
Pectin is the actual jellifying substance and is found in many fruits in adequate quantity. If pectin is lacking, apple juice extract or commercial pectin may be used. All fruits have more pectin when underripe.
Commercial pectin is available in both liquid and powder forms. It is essential to follow the manufacturer’s instructions or tested recipes as in U.S. Department of Agriculture publications. These preparations generally bring higher yields plus the advantages of being able to use fully ripe fruit, with a shorter cook time and more uniform results.