Old Virginia Spoon Bread

1 c Martha White self-rising corn meal
1 1/2 c boiling water
1 tbs butter
3 egg yolks, beaten
1 c buttermilk
1 tsp sugar
1/4 tsp baking soda
3 egg whites, beaten only enough to hold soft peaks

Heat oven to 375°. Grease a 2-quart casserole. Pour boiling water over corn meal. Stir to keep from lumping until cooled slightly. Add butter and egg yolk and stir until egg is thoroughly blended. Stir in buttermilk. Blend in sugar and soda. Fold in egg whites. Pour into greased casserole. Bake 45 to 50 minutes. Serve hot with butter.