Place cauliflower florets in a steamer, and steam until they're soft (about 20 minutes)
Saute garlic in olive oil until it's soft and fragrant, about 5 minutes
Add butter to oilve oil and garlic and melt, then set aside
When the cauliflower is done, puree in a food processor until smooth.
Add the garlic, oil and butter mixture to the food processor, and process until it's mixed through
Add salt and pepper to taste