Remove the meat from the fridge up to 1 hr before cooking to come up to room temperature. If it’s a hot day, you can reduce that to 30 mins. Heat the oven to 240C/220C fan/gas 9.
Turn the meat in the marinade to make sure it is well coated, leaving the fatty layer on the top. Put half the sliced onions underneath the meat and spread the rest over the top. Cover the dish loosely with foil, making sure it is properly covered.
Roast for 15 mins, then turn the oven down to 170C/150C fan/gas 3 and cook for a further 2 hrs 30 mins-3 hrs. Check it to see how tender it is – a fork should go in and come out easily and the meat should flake well, if not, put back in the oven for another 30 mins.
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