Pasta Primavera With Shrimp

12 ounces penne pasta 2 tablespoons unsalted butter 2 tablespoons olive oil 1 pinch red pepper flakes 1 leek , both white and light green parts, washed and[...]

1 1/2 cups baby carrots, trimmed (about 6 ounces) 2 cups sugar snap peas 3 cups uncooked cavatappi pasta or 3 cups penne pasta (about 8 ounces) 1 teaspoon[...]