Cooking for Nookie

1 pound rock shrimp or large white shrimp, shelled, deveined and chopped 1 tablespoon olive oil 1 tablespoon butter 1/4 teaspoon kosher salt 1/8 teaspoon each black pepper, Cayenne pepper, Cumin, Paprika and Oregano 1/2 lemon,  juiced 1 clove garlic, chopped 1/4 sweet onion, chopped 1/2 cup button mushrooms, cleaned and chopped 1/2 cup sweet [...]