1 c. mayonnaise
1 c. sour cream
1 c. buttermilk
1/3 c. Dijon style mustard
1/3 c. grated onion
1/3 c. wine vinegar
3 tsp. cumin seed
Salt and pepper to taste
1 tsp. Worcestershire sauce

In a bowl, combine mayonnaise, sour cream, and buttermilk. Stir until smooth. Add mustard, onion, and vinegar. Stir in cumin seed, salt and pepper to taste. Chill, covered, at least 6 hours. Stir in Worcestershire sauce and check seasonings (salt and pepper).