Boil water in a medium to large saucepan, enough to cover the asparagus and peas. In a separate pot, boil salted water for pasta. Prepare the pasta to package directions.
8 oz Pasta
Using a knife, liberally trim off the stems of the asparagus, leaving a pile of asparagus tips and a pile of stems. Set both aside. If using frozen peas, thaw them in a strainer or a dish of warm water.
1 bunch Asparagus, 1¼ cups Green peas
Once the water not used for pasta is boiling, add the asparagus stalks (not the tips) and peas, and let simmer for 10 minutes or until the stalks are very soft.
Strain the peas and asparagus stalks, then add them to a blender or food processor and blend until very smooth.
Pass the blended sauce through a fine sieve, pressing down with a spoon until any remaining fibrous bits are removed. Discard anything left in the sieve. Mix the parmesan and lemon zest into the creamy sauce.
6 Tablespoons Parmesan cheese, 2 teaspoons Lemon zest
Finally, add the butter and asparagus tips to your skillet and cook over medium-high heat until golden brown and soft, and season with salt and pepper.
1 Teaspoon Salt, 1 Tablespoon Butter, Black pepper
Combine the pasta, sauce, and asparagus tips in a bowl and mix well, then serve with extra parmesan cheese and enjoy!