Pizza Express Leggera pizza?

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I'm going out for a meal tonight to Pizza Express and so I'm obviously going to be trying their new Leggera range (for those of you who haven't heard of them, they are 500 cal pizzas, in a doughnut shape with a salad centre) but they all look so nice! Can anyone who has tried one recommend a topping to choose? Also, have any of you tried the Sotto Zero (low fat frozen yoghurt) and if so is that any good?