Lemon Juice. If you can't handle lemon juice, add an extra teaspoon of olive oil and a ½ teaspoon of sumac. It won't taste quite the same, but the olive oil will make up for the lost liquid, the sumac will add some tartness, and using frozen cauliflower ensures that the cell walls are already mostly broken down.
Freezing It. You can freeze this once you've made it, but if you're working from frozen cauliflower initially, then I highly recommend eating all you can of it fresh, because the crispness doesn't translate well after it's been frozen a second time.