Mustard Tomato Sauce 0 (0) Mustard Tomato Sauce 1 15 oz can tomato sauce 1/2 cup brown sugar, lightly packed 2 tsp prepared yellow mustard Combine all the ingredients in a small saucepan. Whisk to combine. Cook over medium low heat for 10 minutes. Serve warm. Your Rating: Average rating 0 / 5. Vote count: 0