Wash the cauliflower, towel dry, trim the outer leaves, and cut it into florets or chunks.
1 cauliflower head
Place the cauliflower florets in a microwave-safe bowl. Add 4 tablespoons of water to the bottom of the bowl, cover it with a microwave-safe plate, and microwave on high for about 10 minutes, until very tender.
Meanwhile, place the butter, garlic, Parmesan, salt, and black pepper in your food processor's bowl.