@ Framemaker- Just to throw it out there, langostino is not actually a lobster or shrimp; they are more closely related to hermit crabs than either of the aforementioned crustaceans. That being said, langostinos make an excellent substitute to shrimp or lobster in a dish.
You can make an easy shrimp scampi (or any other seafood scampi for that matter) by sautéing shallots and garlic in half butter and half extra virgin olive oil. Once the shallots and garlic are aromatic, add a punch of red pepper flakes, your seafood, and a pinch of sea salt and crushed black pepper corns. Sauté for a few minutes then deglaze the pan with white wine and lemon juice. Toss the scampi with some fresh fettuccine, garnish with shaved Parmesan and a touch of chopped Italian parsley, and serve.