Boil the cauliflower until soft. Meantime dice the onion and garlic and saute until soft. Remove the cauliflower from the water and place in a food processor. Add the sauteed onion and garlic. Pulse in the mixer. Add the salt, pepper, herbs and cheese. Continue pulsing and slowly add the stock until you get a creamy alfredo consistency. You may need more or less stock than what's recommended.