This appetizer has been one of the restaurant's most popular since it opened in 1950. For a pretty presentation, arrange the crab legs in Belgian endive spears, and garnish with cucumber and radicchio.
Preparation Place dry mustard in medium bowl. Add 1 tablespoon boiling water and stir to form paste. Cool. Whisk in mayonnaise, lemon juice, Dijon mustard and horseradish. Season to taste with salt and pepper. Serve sauce with crab legs.