Vegetable oil
1 tablespoon kosher salt plus 1 1/2 teaspoons
3/4 pound linguine
3 tablespoons unsalted butter
2 1/2 tablespoons good olive oil
1 1/2 tablespoons minced garlic (4 cloves)
1 pound large shrimp (about 16 shrimp), peeled and deveined
1/4 teaspoon freshly ground black pepper
1/3 cup chopped fresh parsley leaves
1/2 lemon, zest grated
1/4 cup freshly squeezed lemon juice (2 lemons)
1/4 lemon, thinly sliced in half-rounds
1/8 teaspoon hot red pepper flakes