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.

Saute the onion, celery and green pepper in butter.,Boil water.,______,Add rice and stir.,Combine rest of ingredients.,Bake in a covered 9 x 12-inch casserole dish about 30 minutes at 350.,Serve hot.
Add soup mix and stir.