Place brisket in large Dutch oven. Add 1/2 cup water. Cover and bake at 275F for 2 hours. In a medium saucepan, saute onion and garlic in oil until tender. Add ketchup, vinegar, lemon juice, brown sugar, Worcestershire sauce, cornstarch, paprika, chili powder, salt, pepper and remaining water. Simmer uncovered 1 hour, stirring occasionally. Add liquid smoke. Mix well. Drain drippings from Dutch oven. Pour sauce ever meat. Cover and bake 1 to 2 hours longer or until meat is tender. Slice and serve.
Cajun Country -- New Iberia, Louisiana