Anyone who has wasted hours of their life in the kitchen beaded with sweat as they prepare an ornate risotto or a slow-cooked stew will know that a rollicking time with their guests will have to come at the tail-end of the night. Is it of any surprise that the “fuss-free” Roasting Tin series by Rukmini Iyer has now made over a million sales? After all, it is premised on the satisfyingly simplistic formula of: chop it all up, bung in a tin, go and join your guests in yuletide merriment and let the oven polish off the job.