1 tsp. butter
1 tsp. salt
1 tbsp. sugar
1 tsp. dry mustard
4 tbsp. vinegar
4 egg yolks, beaten
8 marshmallows
1 c. whipped cream
1 c. chopped nuts

Cream butter, salt and sugar. Dissolve mustard in small amount of vinegar and add to the butter mixture with the egg yolks and remaining vinegar. Cook in a double boiler until you're sure the egg yolks are done. Add the marshmallows and stir to dissolve. Chill. Fold in the whipped cream and chopped nuts.