You will be given a definition of a task first, then some input of the task.
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.

Brown ground chuck, onion and garlic; cool.,______,Spoon enough sauce to cover bottom of 9 x 13-inch pan.,Stuff cooked shells and place in pan.,Cover with sauce and sprinkle with Parmesan cheese. Bake at 400 for 20 to 25 minutes or until hot.
Output:
Add Mozzarella cheese, bread crumbs, parsley, egg, salt and pepper.