Stir together the cranberry sauce, preserves or spreadable fruit, onion, lemon juice or vinegar, and chipotle or jalapeno pepper in a small saucepan. Bring to boiling, stirring constantly. Reduce heat and simmer, uncovered, for 5 minutes, stirring occasionally.
To use, brush pork or chicken with some of the sauce during the last 10 minutes of grilling. If desired, reheat and pass additional sauce. Cover and refrigerate remaining sauce up to 2 weeks. Makes about 1-1/2 cups (six, 1/4-cup servings).