Mama Ethel'S Barbecue Sauce
["1 large can tomato sauce", "1/3 c. cooked, diced onions (optional)", "2 whole lemons", "1/2 tsp. garlic powder", "1 Tbsp. chili powder", "1 Tbsp. oil", "1/4 c. white vinegar", "1/2 to 3/4 c. sugar"]
["Combine tomato sauce, chili powder, vinegar, onions, garlic powder, oil and sugar.", "Mix well.", "Roll lemons to soften.", "Slice lemons and squeeze juice into mixture.", "Stir well.", "Add lemon rinds.", "Stir and simmer (uncovered) for 30 minutes.", "(One-half teaspoon of ground cayenne pepper may be added for a spicier sauce.)"]
["tomato sauce", "onions", "lemons", "garlic powder", "chili powder", "oil", "white vinegar", "sugar"]