The three Scotland chefs hope to impress with their main dishes. Angela Malik prepares a tiffin box featuring a summer biriyani, quail scotch egg and spiced quail breasts, while Michael Bremner takes a huge risk by using ox tongue as the centrepiece of his main. Ally McGrath devises an inventive take on the summer barbecue, using a new method of cooking potatoes to recreate the coals
