Bring the instant pot to a saute mode and add 1 cup of water. Allow the water to boil, and insert a trivet.
Once the water starts to boil, insert the steam rack with cauliflower and put the instant pot into a steam mode and set the time to 1 minute.
After 1 minute, quick release pressure and take the steam rack out. Give cauliflowers an iced bath and transfer them to a colander.
At this point, cauliflower florets will be soft enough for a potato masher for fine shredding.
If you want, you can also use a hand blender with chopper attachment to shred the cauliflower florets till riced.
If you are like me and want perfectly riced cauliflower, then transfer the cauliflower florets to a food processor and process until riced. Your cauliflower rice is ready.