Preheat oven to 375ºF
Place all of the cut vegetables in a baking dish⏤9x13 or a medium-sized circular dish.
Add the lamb on top of the vegetables, and then add the peppers.
In a large measuring cup, add the passata, water, olive oil, garlic, and spices. Mix then pour over the vegetables and lamb.
Cover the baking tray with foil and bake for 1 hour.
After 1 hour of baking, remove from the oven, then remove the foil. Using a large spoon, carefully mix the vegetables and lamb, try to avoid breaking the vegetable as much as possible. (If you notice it's really dry, add ½ cup of water to thin out the mixture-you're looking for a stew constancy)
Place the tray back into the oven without foil and continue baking for 30 minutes or until the lamb is fork-tender.
Once the lamb is tender, remove from the oven. Mix to distribute the sauce over the veggies and meat.
Serve and enjoy!