Preheat Oven 350 F. In A 11 X 7 X 2 Inch baking pan, spread shrimp to cover the bottom in 1 layer. Sprinkle evenly with cayenne pepper. Add more pepper for hotter shrimp. Dot shrimp with margarine. Bake in 350 F oven for 5 minutes. Stir shrimp thoroughly to coat with margarine. Bake 5 more minutes, then stir again. Bake 5 more minutes and remove from oven. Serve hot, immediately. Do not overcook or else shrimp will becom mushy. Serve as is, peeling them at the table. Yields 1 pound.