Adding Syrup or Hot Water. Fill jars to within half an inch of top with boiling liquid, pouring it slowly to avoid breaking. For vegetables, expect tomatoes, use boiling water and allow one teaspoon of salt to each quart jar. For tomatoes use tomato juice and no water. For fruits, make a syrup by boiling two parts water with three parts sugar. This may be boiled only long enough to dissolve the sugar, if fruit needs very little sweetening; or to a very thick syrup for rich preserves. For unsweetened fruits use only water or fruit juice and no sugar.
Cut spinach or other greens diagonally with a knife after they are in the jar, so that water can reach center of greens in jar.
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