Chocolate Mousse
["1/3 c. butter", "5 egg yolks", "5 tsp. rum (optional)", "4 egg whites", "1 1/2 c. heavy cream", "3/4 c. cocoa", "1/2 c. sugar", "1 tsp. vanilla", "1/4 c. sugar"]
["Melt butter in small saucepan.", "Remove from heat.", "Stir in cocoa.", "Beat yolks in small mixer bowl with 1/2 cup sugar until thick and lemon colored. Beat in chocolate mixture, rum and vanilla."]
["butter", "egg yolks", "rum", "egg whites", "heavy cream", "cocoa", "sugar", "vanilla", "sugar"]