What to eat as 'the main event' for Christmas Dinner can be an annual dilemma, trying to find something suitably festive, with a bit of wow-factor, that the turkey-eaters won't scoff at. We've tried all sorts of recipes over the years - moroccan-spiced filo affairs, gooey baked cheesey pies, nutty patties, mushroomy wellingtons, aubergine stacks,