Given the task definition and input, reply with output. In this task, you will be presented with the directions of a recipe separated by "," and have to fill in the "___" which is a step that is missing from the recipe.

Put basil, Italian parsley, walnuts, olive oil, garlic, lemon juice and salt in food processor. Blend until basil and parsley are chopped up small to make pesto.,Cook pasta according to package directions.,Place pasta in serving dish, mix in pesto mixture.,______
Add all other ingredients, toss and serve.