Slow-roast lamb with cinnamon, fennel & citrus

Put the lamb into a large food bag with all the juice and marinate overnight.

The next day, take the lamb out of the fridge 1 hr before you want to cook it. Heat oven to 220C/200C fan/gas 7. Take the lamb out of the marinade (reserve remaining marinade) and pat dry. Rub with half the oil and roast for 15-20 mins until browned. Remove lamb and reduce oven to 160C/140C fan/gas 3.