Cook pasta according to directions on the package. Save the pasta water!!
2 cups dried pasta
After you've drained the pasta, return it to the same saucepan or put it in a large bowl. Add the ricotta, peas, lemon juice, and zest. Stir together and slowly add in the pasta water, stirring after each little addition. Stop when you've reached your desired consistency.
1 cup whole milk ricotta cheese, ½ cup frozen peas, Juice and zest of 1 lemon