In Ever Wondered about.... Pies, Alan Coxon bakes a savoury tart and gives tips on making foolproof pastry, while Kathy Sykes explains the secrets of perfect puff pastry and how to avoid a soggy pie base. Michelin-star cooking is also on the menu today as Gregg Wallace is joined by chef Robbie Millar from Northern Ireland, who turns an ordinary piece of tuna into a classy tartar with basil-scented cous cous, then, for the main course, prepares a summery fricasse made with corn-fed chicken, ratte potatoes, asparagus and wild mushrooms, followed by a dessert of fresh fig puff with lavender ice cream.