Material cooked before it is put into the can. This is a good method for berries, and for fruit that will be served as a sauce. Proceed in the preparation and finishing according to the general directions. Cook the fruit gently for half an hour. Use as little water as possible. No sugar is required in the canning process, but the flavor is better if a small amount is used in the beginning, a half cup of sugar to a pound of fruit.
Material cooked in the can. This is the better method for whole fruit and halves. Select firm, well-shaped fruit for this method, rejecting the mellow and soft fruit. Pack the cans tightly with the fruit, and pour in hot water with sugar dissolved in it, a half cup to the quart can. More sugar can be used, if so desired. Set the jars in a boiler on a rack, and surround them with warm water, to a height that will not allow the water to boil into the cans.
Set the cover on each jar, but do not fasten them. Cover the boiler closely, bring the water to a boil, and allow it to boil for an hour. At the end of this time, test the fruit for tenderness with a fork, pour in more sirup if it is necessary. Remove the jars when the water has cooled sufficiently, and adjust the covers. Cold water is sometimes used at the beginning, but this makes the process longer.
This is a good method also for the canning of whole vegetables like peas and asparagus. The cooking of vegetables should continue for at least two hours, and three hours are better for peas and string beans.
Apparatus is constructed for this method of canning, but the ordinary boiler answers the purpose.