4 egg yolks
2 tbsp. fresh lemon juice
1 tsp. white vinegar
1/4 tsp. salt
1/8 tsp. cayenne pepper
3/4 c. (1 1/2 sticks) butter

Place yolks, lemon juice, vinegar, salt and cayenne in blender or food processor. Blend 5 seconds. Heat butter until it sizzles. Pour in a steady stream into blender. Turn off motor as soon as mixture has thickened. Makes 1 cup.