Begin by bringing a large pot of salted water to a boil. Once boiling, add the linguine or spaghetti and cook according to the package instructions until al dente. Before draining, reserve about 1 cup of the pasta cooking water. Drain the pasta and set it aside.
In a large skillet, heat the unsalted butter and extra virgin olive oil over medium heat. Allow the butter to melt and blend with the olive oil, creating a rich base for the sauce.
Once the butter has melted, add the minced garlic and red pepper flakes to the skillet. Sauté for about 1-2 minutes, stirring frequently, until the garlic becomes fragrant and just begins to turn golden.
Add the peeled and deveined shrimp to the skillet, seasoning them with salt and pepper. Cook for 2-3 minutes, flipping the shrimp halfway through cooking, until they turn a lovely pink color and are opaque throughout.
Add the fresh lemon juice and stir in the lemon zest. Allow the ingredients to mingle and cook for another minute.
Carefully add the drained pasta to the skillet, tossing it well in the garlic butter sauce to ensure each strand is coated. If the sauce looks dry, gradually add reserved pasta water, a little at a time, until it reaches your desired consistency.
Stir in the finely chopped parsley, combining everything thoroughly. Taste and adjust the seasoning if necessary.
Serve the shrimp scampi hot, garnished with a generous sprinkle of grated Parmesan cheese if desired, along with an additional touch of chopped parsley.