Add the pasta and a pinch of salt to the boiling water.
Cook for 8-10 minutes according to the directions on the pasta package. Meanwhile, add parsley, strained Greek yogurt, walnuts, olive oil, lemon juice, and a pinch of salt into the blender and mix.
Transfer the mixture from the blender to a preheated saucepan and heat.
Drain the boiled pasta, then transfer it to the serving plate.
After drizzling the sauce over it, finally, garnish with a whole walnut and some parsley leaves.
Video
Notes
After the pasta is boiled, it should never be washed and should not come into contact with water.
While heating the blended sauce, you can add a ladle of pasta water. This will enhance its flavor but may dilute the sauce a bit.