Heat the cooking oil in a large heavy cast iron skillet. Add the onion and the garlic. Sauté this lightly. Stir in the catsup, Worcestershire sauce, lemon juice, white vinegar, hot pepper sauce, sugar, paprika, chili powder and salt. Blend together thoroughly the dry mustard and the water until smooth. Then stir this into the sauce. Slowly bring this mixture to a boil. Cover and let simmer for 20 minutes. Makes 2 cups. Sam used this spicy concoction both as a marinade and a basting sauce for his barbecued steaks, chops and chicken.