Ingredients

2 cups fresh blueberries, rinsed and dried (two 1/2-pint containers) 

2 cups seedless red grapes, rinsed and dried 

1/3 cup sugar 

1 tablespoon finely chopped peeled fresh ginger 

1 teaspoon finely chopped fresh rosemary 

2 tablespoons red-wine vinegar 

Coarse salt and ground pepper 

Preparation

In a large skillet, combine blueberries, grapes, sugar, ginger, rosemary, and vinegar. Bring to a boil; reduce heat, and simmer gently until grapes begin to break down, 15 to 20 minutes

Season with 1/4 teaspoon salt and 1/4 teaspoon pepper. Let cool completely before using or storing.