First, cook the pasta according to the package directions, with a pinch of salt, and drain. Don't forget to cover the pasta to keep it warm.
Make sure to dry the shrimp with paper towels; season them with pepper and a ¼ teaspoon of salt.
Heat half of the olive oil in a skillet and add the shrimp. Cook and stir them for about 3 to 4 minutes. Put into the plate, and cover to keep warm.
In the same skillet, add leek, garlic, and ½ teaspoon of salt. Cook while stirring often. Add peas, cream, lemon zest, lemon juice to it and reserve ½ cup cooking liquid until leek is slightly tender.
Simmer until sauce thickens on medium heat with the heat reduced.
Add the shrimp to the skillet and then divide the pasta into 4 servings. Ladle the shrimp sauce evenly on all 4 plates and you're ready!