Mix vinegar and olive oil; reduce mixture to ½ cup. Add chopped cherries, mustard, sugar, herbs, salt and pepper; simmer 10 minutes. Reserve half of sauce for marinade. Add halved cherries to remaining sauce; return mixture to a boil and simmer about 1 minute. Serve with grilled meat, poultry, or fish. Makes 4 servings sauce (and about 1/3 cup marinade).