Cream butter, add sugar gradually, stirring constantly. Sift together flour, salt and Ryzon, add to first mixture alternately with milk. Add extract. Then cut and fold in whites of eggs beaten until stiff.
Fill buttered cups two-thirds full. Arrange cups in a steamer, place steamer over boiling water, cover cips with buttered paper (buttered side down), adjust cover and steam 35 minutes. Serve with Hot Marshmallow Sauce.