This dish was born out of a shopping trip with my friend Danielle, where we ate meatballs, insane quantities of lingonberry jam, mashed potatoes (me) and chips (her) before attempting to navigate the three-floored heaven/hell that is the North London IKEA. She very kindly brainstormed this dish with me on the bus home, transforming it from a slightly odd traybake involving rhubarb into the rather lovely recipe below.