
Wash the cauliflower and cut it into equal large size florets (see recipe post for how to easily cut a cauliflower).
Add water to the instant pot insert. Place the steamer basket in the instant pot insert with the cauliflower florets.
Start the instant pot and set it on manual or pressure cook mode for 0 minutes on high pressure with vent in sealing position. (Update: Many readers enjoy crunchier cauliflower, for which 0 minutes at low pressure works great)
When the instant pot beeps, quick release the pressure manually. Remove the steamer basket carefully as it is hot.
You can place this basket under cold water for a couple of minutes to stop the cooking, give it in an ice bath (optional) or just eat the cauliflower as is.
Season with salt, pepper and enjoy.