Shrimp Scampi

Start boiling water for one package angel hair pasta.
In a large skilled over medium heat saute 1/2 of an onion, diced, in 4 T butter and 2 T olive oil.  Add 4 cloves garlic and then 1 pound shrimp.  Let cook until no longer gray.
Add the juice from 3 lemons, 1/3 cup water, 4 dashes of hot sauce or 1/4 teaspoon chili powder, salt and pepper to taste.  Stir and reduce heat to low.
Boil angel hair pasta in water.  Drain but reserve a cup of the water.
Remove skillet from heat, add pasta and toss, adding additional water if sauce starts to get too thick.  Add additional salt and pepper if needed.  Top with grated Parmesan cheese and chopped parsley.  S
Serve immediately.