3 1/2 pounds beef brisket
3 onions, thinly sliced
2 cups liquid smoke flavoring
3 cups ketchup
3 cups distilled white vinegar
1 (14.5 ounce) can beef broth
1 1/4 cups water
4 cubes beef bouillon
4 cubes chicken bouillon
3 teaspoons white sugar
1 teaspoon vegetable oil