1/2 c ketchup
1/4 c. lemon juice (or less)
1 tbsp. Worcestershire sauce
2 tsp. horseradish
6 tbsp. minced celery
3 tbsp. grated onion (or less)
1/4 tsp. salt

Chill. Yields 1 1/2 cups sauce. 1 cup sauce will serve 4 to 6 cocktails. Sauce can also be used as bloody mary mix.