
Place the lamb shoulder into your baking dish along with the potatoes, onions, and cleaned garlic cloves.
Pour in the olive oil, then add the salt, pepper, cinnamon, and cumin while mixing to ensure the lamb and vegetables are evenly coated.
Blend the tomatoes until smooth and pour them over the lamb and vegetables. Mix again to distribute the tomato sauce evenly.
Cover the baking dish with wet parchment paper and tightly seal with foil to retain moisture.
Bake at 180°C (fan-forced) for 4 hours.
Allow to rest for 10 minutes before serving.