In large cast iron frying pan, melt the 1/4 cup butter with olive oil. Add garlic
and hot red pepper. On low heat cook about 10 minutes, so as to blend flavors. Add
shrimp and cook until they are a deep pink.
In small frying pan, melt the 4 tablespoons butter. Add onion with red and green
pepper slices. Cook until soft, not browned.
Place in small serving dish. Divide shrimp mixture into the two buns, and drizzle
with the drippings. Top with onion/pepper mixture.