I have a question about step 4 on the recipe "Sweet Potato Gnocchi with Chestnut Pesto" from Janneke Verheij. It says:
"Put them in a kitchen machine with the Parmesan, walnuts, parsley and olive oil. Grind into a coarse pesto, it should not be a smooth paste. Season with pepper, salt and a squeeze of lemon juice."
Hi, the instructions say to add olive oil, I was wondering how much as its not specified in the ingredients list.