Take out yolks and place them in a bowl. Add cheese ricotta and pesto sauce. If you do pesto crush pieces of parmesan in the blender, then add spinach, garlic and pine nuts and crush to uniformity. Mix olive oil until pesto becomes smooth.
Knead yolks, ricotta and pesto a fork before receiving uniform mashed potatoes. Add lemon juice, salt and pepper and olive oil. If mix turns out too dry, add a little more olive oil.