Prep Time::10 mins
Cook Time::20 mins
Additional Time::30 mins
Total Time:: 1 hr
Servings::32
Yield::2 cups
Ingredients
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4 cups blackberries
1 cup white sugar
2 tablespoons cornstarch
¼ teaspoon ground cinnamon
¼ teaspoon ground allspice
½ teaspoon lemon juice
Directions
Mash blackberries in a saucepan with a potato masher; stir in sugar until juices are released. Remove 1 tablespoon blackberry juice from the saucepan; mix with cornstarch in a small bowl. Stir cornstarch mixture back into the saucepan.
Bring blackberries to a boil; cook, stirring often, until jam has thickened, about 15 minutes. Stir in cinnamon and allspice.
Remove saucepan from the heat and allow jam to cool, 30 to 45 minutes. Transfer jam to a bowl, cover, and refrigerate until chilled. Stir in lemon juice before serving.