Linguine With Spicy Shrimp 3/4 pound linguine 1/4 cup olive oil 1 1/2 pounds peeled and deveined large shrimp, tails removed 2 cloves garlic, chopped 1/4 to 1/2 teaspoon crushed red pepper kosher salt 2 bunches watercress, torn (about 6 cups) 1 tablespoon grated lemon zest