Add a steamer insert to a large soup pot. Then add 2 cups of water, cover, and bring the water to a boil over high heat. Add the cauliflower and steam until fork tender (13-15 for 1-2 heads, or 17 minutes if you are using 3 heads).
You can also store in an air-tight container in the refrigerator for up to 4 days. Reheat in the microwave.