Melt butter in a medium saucepan over medium heat. Add onion and cook until tender, about 5 minutes; add garlic and cook 1 minute longer. Stir in remaining ingredients and bring to a low boil; reduce heat to low and simmer 15 to 20 minutes, stirring occasionally.
Makes 3 1/2 to 4 cups.
A real Texas red sauce - great for beef.