Active Time

　　10 minutes

　　Total Time

　　1 hour

Ingredients

　　1 small onion, finely chopped

　　1 tablespoon vegetable oil

　　1 pound black plums (4), pitted and coarsely chopped

　　1 1/4 cups water

　　1/4 cup plum jam

　　2 teaspoons balsamic vinegar

　　2 teaspoons Dijon mustard

　　1/4 teaspoon black pepper

　　1/4 teaspoon salt

　　Cook onion in oil in a 3- to 4-quart heavy saucepan over moderate heat, stirring occasionally, until golden, about 5 minutes. Stir in remaining ingredients and simmer, uncovered, stirring more frequently toward end of cooking, until plums fall apart and sauce is thickened, about 1 hour. Cool to room temperature. Serve with pork or chicken.