In a large skillet over medium-high heat, add 2 tablespoons butter and olive oil and heat until butter is melted. Stir in the garlic and lemon zest until fragrant, about 30 seconds.
Stir in the wine, red pepper flakes if using, and salt and pepper to taste (I like 1 teaspoon salt and 1/2 teaspoon pepper). Bring to boil. Add the shrimp, cover, and cook until the shrimp are slightly translucent, about 2 minutes.
Reduce the heat to medium and cook until the shrimp are just cooked through, about 2 minutes longer. Remove from heat and stir in lemon juice and remaining 2 tablespoons butter. Season to taste with salt and pepper and garnish with parsley.
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Notes
Lemon: Zest the lemons before you cut them in half for juice.
White wine: Choose a dry variety such as Pinot Grigio, Chardonnay, or Sauvignon Blanc. Substitute chicken broth or shrimp stock if you want to omit the wine.
Shrimp: For the best flavor, buy individually quick frozen raw shrimp. Thaw frozen shrimp overnight in the refrigerator or in a bowl in the sink with a trickle of cold water running over them. To clean the shrimp, use a paring knife to cut along the dark vein on the back of each shrimp and remove it. Rinse out the back of each shrimp and pat dry with paper towels.
Yield: This recipe will make about 24 ounces of cooked shrimp, enough for 4 servings, 6 ounces each.
Storage: This recipe is best enjoyed the day it is made.