Step 1

In a medium bowl, whisk together the garlic, cheese, oil, lemon juice, red pepper flakes (if using), a couple pinches of salt, and plenty of black pepper.

Step 2

Add the thawed peas and stir to combine. Taste and adjust the salt and pepper as needed. Use the back of a fork to roughly mash just half of the peas, and leave the other half whole.

Step 3

Meanwhile, bring a large pot of salted water to boil and cook the pasta according to the package instructions. Drain and toss the pasta with the smashed peas and a few large spoonfuls of pesto. Taste, and add more salt and pepper if necessary.

Step 4

Top with the basil, lemon slices, and a light grating of cheese before serving.