1 stick butter
1-1/2 cups stiff mayonnaise
2 tablespoon horseradish
1 small onion, finely chopped
1/2 teaspoon dry mustard
1/4 teaspoon cayenne pepper
1/2 teaspoon salt
2 teaspoons pepper vinegar or tarragon vinegar

Place all ingredients in a quart jar and set in a pan of hot water on a low heat. Stir until well blended. Pour over vegetables just before serving.

While this is mainly for serving over green beans or other green vegetables, it also makes a good sauce for seafood. Keeps well in the refrigerator.

Serving Size: 4