Brown onion in the oil and add remaining ingredients. Simmer for 30 minutes. Transfer to a blender and thoroughly blend, making a smooth sauce.
Use, for beef, chicken, pork, or lamb.
1 each onion -- finely chopped
2 tablespoons fat or cooking oil
2 tablespoons vinegar
2 tablespoons brown sugar
4 tablespoons lemon juice
1 cup catsup
3 tablespoons Worcestershire sauce
1/2 cup water
1/2 teaspoon Tabasco sauce salt to taste
liquid smoke (optional)