Step 1

Cook pasta in a large saucepan of boiling water according to package directions for al dente. Drain, reserving 1/2 cup cooking water. Set aside.

Step 2

Heat oil in a large nonstick skillet over medium heat. Add onion, garlic and lemon zest; cook, stirring often, until the onion softens, about 5 minutes. Add shrimp and crushed red pepper; cook, stirring and turning the shrimp often, until the shrimp are just slightly translucent in the center, about 3 minutes. Add wine; cook, stirring constantly, for 30 seconds. Add the drained pasta, the reserved 1/2 cup cooking water and butter. Increase heat to medium-high; cook, stirring with tongs, until the sauce is creamy, 1 to 2 minutes. Remove from heat; stir in parsley, lemon juice and salt. Divide among 4 bowls; sprinkle evenly with Parmesan. Garnish with additional parsley, if desired.