The rules are:
*Have to make up the desert recipe yourself
*The judges (Parents) have to judge fairly
*No peeking on your opponent's desert (That one was hard :)
*You cannot ask for grown-up advise and can't consult the judge about your desert before the contest
*The judge has to judge on the presentation and taste of the desert
*Both teams have to have loads of fun and not be overly competitive.
Making the deserts