Steak Tenderizer

1/2 cup catsup
2 cups water
1/4 cup lemon juice
1/4 cup dark vinegar
1 cup vegetable oil
3 tablespoons soy sauce
2 tablespoons prepared mustard
1 teaspoon coarse black pepper
1 teaspoon garlic salt
1/2 teaspoon Durkee smoked salt
1 large onion, cut into wedges

Combine ingredients; place steaks in it for 24 hours in refrigerator, covered.

Drain well; broil or cook on grill.