Finely grate the cauliflower (or use a food processor) - until the cauliflower resembles rice granules.
Cook in a microwave-safe bowl, covered with cling-wrap, for approximately 5-6 minutes.
Tip onto a clean tea-towel, or a number of sheets of paper towel. You need to get as much of the moisture out as possible.
Mix in the egg, garlic and oregano until well blended.
Spread onto baking paper into a pizza crust shape and bake at 180C/350F for approximately 30-40 minutes. Be careful not to leave it in too long as it will burn, but too short leaves it a little soggy.
Add your favorite toppings and bake for another 10 minutes.