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.

In large pot, sautee onion, celery and garlic in olive oil on medium heat until onions are translucent (do not brown), Add remaining ingredients and bring to boil, turn down heat and simmer, covered, until cauliflower is tender, about 20 minutes,______, Serve with shaved cheese on top, Can be made up to two days ahead, heat through before serving,
Puree in batches, return to pot, season with salt and pepper and thin with milk if necessary