This is not the usual heavy sweet barbecue sauce. Because it is lighter, it tastes great with chicken or fish, either brushed on while cooking or as a dipping sauce. It will keep for one month refrigerated.

1 cup apple-cider vinegar

2 tablespoons brown sugar

2 tablespoons dried mustard powder

2 tablespoons lemon juice

2 teaspoons hot-pepper flakes

2 tablespoons Worcestershire sauce

1/4 cup ketchup

Whisk all ingredients together in a bowl. Taste and adjust seasoning. Makes about 2 cups.