Lemony Shrimp Cavatappi

In a large pot of salted boiling water, cook cavatappi according to package directions until al dente. Drain, reserving 1/2 cup pasta water, and return to pot. Meanwhile, cook shrimp. In a large skillet over medium heat, melt butter. Add lemon juice and chives and season with salt. Bring to a simmer. Once simmering, add shrimp and cook until pink, 2 minutes per side. Add cooked pasta and lemon slices to skillet and serve.