We don't recommend this for two reasons. One- cauliflower needs to be blanched before freezing (see how to freeze cauliflower). You can purchase frozen cauliflower and store this with the bag, then throw it in after the 5-minute pressure cook. I haven't tested with frozen cauliflower but think it would still need a 1 minute of cook time. Two- cooking the cauliflower for 5 minutes is way too long. I will end up mushy and completely disintegrated.