New Orleans Barbecue Shrimp

1. In a large black cast iron sauté pan, melt the butter, then add the oil and mix well.
2. Add all the other ingredients except the shrimp and lemons. Cook over medium heat, stirring constantly, until the sauce begins to boil.
3. Reduce the heat and simmer for 7 to 8 minutes, stirring frequently.
4. Remove from the pan from the heat and let it stand uncovered, at room temperature for at least 30 minutes.
5. Add the shrimp and toss in the sauce, and even them out in one layer.
6. Put the pan back on the burner.
7. Cook over medium heat for about for 6 to 8 minutes, or just until the shrimp turn pink.
8. Squeeze two lemons over the pink shrimp and cover with one thinly sliced lemon.
9. Put the pan in a preheated 450°F oven and bake for 10 minutes.
10. Serve in soup bowls with the sauce and crusty Italian bread on the side.