Queen's Chocolate Cake

Place chocolate morsels in top of a double boiler; bring water to a boil.

Reduce heat to low; cook, stirring occasionally, until chocolate melts.

Remove from hot water; let cool completely. Stir in rum.

Combine egg whites, cream of tartar and salt in a small mixing bowl; beat at medium speed of an electric mixer until foamy.

Add 2 tablespoons sugar, 1 tablespoon at a time, beating at high speed until stiff peaks form.

Cover; set aside.