1 lb medium uncooked shrimp, cleaned and deveined
1 small onion, diced
1-2 tbsp of butter
3 roma tomatoes
4-7 red dry peppers (chiles de arbol) found in the Latin section of your grocery store
1 small can of tomato sauce
1 tbsp sour cream (optional)
In a small pan, boil the roma tomatoes and red dry peppers with a little bit of water. When done, place in blender and add some salt. I suggest you start out with the minimum amount of peppers and then try it to see how spicy it is for you. You can add more peppers in the blender according to how spicy you want them. When I first made it, I just added 6 peppers right from the start, it was pretty spicy and got a little worried, but when you add the tomato sauce, it wasn't bad at all.
Sautee onion in butter and then add shrimp. When shrimp is done and pink, add the sauce from the blender, the tomato sauce, and the sour cream. Again, the sour cream is not really necessary, I'm sure it will taste fine without, but it could be a good option in case the sauce turned out too spicy for you. Enjoy!