1/4 c. melted butter
1 tbsp. flour
1/4 tsp. salt
1/8 tsp. pepper
Dash cayenne pepper
1 c. milk
1 egg yolk
1 tbsp. lemon juice

Melt butter in small saucepan; add flour, seasonings, and blend. Add milk gradually and stir. Cook until thickened. Pour sauce on slightly beaten egg yolk; mix and cook about 1 minute, stirring constantly. Remove from flame; add lemon juice gradually and beat vigorously. Serve on cooked vegetables. Yield: about 1 1/3 cups sauce.