Fresh, ripe fruit combined with a dash of brandy makes this quick and delicious jam simply burst with the flavor of summer.This is a refrigerator jam, meaning that it isn't "put up" in sterilized jars; it must be kept refrigerated. Since fresh nectarines can vary widely in sweetness, the amount of sugar is given as a range. Use your taste as a guide. Ginger partners beautifully with nectarines, so add 1/4 cup of ginger preserves or minced crystallized ginger, if you'd like.
Place the fruit and water in a saucepan and bring to a simmer over medium heat. Cook for 5 minutes to soften the nectarines, then use a potato masher to mash the fruit to a chunky purée. Add sugar to taste and ginger, if using, stirring to blend.
Bring the jam to a boil, then reduce the heat to low and simmer for 10 minutes or until the jam sheets off the back of a spoon.
Remove from the heat and stir in the brandy and lemon juice. Transfer the jam to a clean glass jar and let cool. Cover and refrigerate.