Shrimp Scampi

2 pounds shrimp, peeled and deveined
Salt and pepper
Olive oil
1/2 small onion, diced
2 tablespoons minced garlic
1 lemon, juiced
½ zest of one lemon
¾ cup white wine
2 tablespoons cold butter
2 tablespoons chopped parsley leaves
Lemon slices, for garnish

Season the shrimp thoroughly with salt and pepper. Heat a large sauté pan over medium-high heat. When the pan is hot, add enough oil to lightly coat the pan. Add the shrimp and quickly sauté on one side for 3 minutes until just starting to turn pink, but not cooked through. DO not stir or flip. Remove from the pan and set aside. Add the onions and sauté just until they begin to soften, about 3 minutes. Add the garlic and cook another 30 seconds. Add the lemon juice, white wine, and reduce by 2/3, about 5 minutes. Take off heat. Whisk in cold butter. Add the shrimp back to the pan and cover with a lid. Let set for 5 minutes. Finish with the parsley and lemon zest. Serve over linguine.