1/2 lb. macaroni
1 tsp. butter
1 egg, beaten
3 c. grated sharp cheese
1 tsp. dry mustard
1 tsp. salt
1 tbsp. hot water
1 c. milk

Boil macaroni in water until tender and drain thoroughly. Stir in butter and egg. Add cheese, reserving enough to sprinkle on top. Put into buttered casserole. Mix mustard and salt with hot water and add to milk. Pour over macaroni. Sprinkle with reserved cheese. Bake at 350 degrees about 45 minutes or until custard is set and top is crusty.