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.

Saute mushrooms in 1/2 stick butter.,Add zucchini, cream and 1 stick butter.,Bring to boil.,______,Add cooked fettucine, Parmesan cheese, parsley, salt and pepper.,(Recipe makes a lot of sauce; you can double the amount of pasta and still have plenty of the vegetables to toss with it.)
Simmer 3 minutes.