Step 1

Preheat oven to 180°C. Heat 1 tbs of the oil in a large frying pan over medium-high heat. Add the lamb, turning, for 5 mins or until browned all over.

Step 2

Transfer the lamb to a large roasting pan. Arrange the onion, garlic, capsicum and rosemary around the lamb in pan. Drizzle with the remaining oil. Season. Roast for 15 mins.

Step 3

Add the mushrooms to the pan. Roast for a further 20-30 mins or until the lamb is cooked to your liking. Cover with foil and set aside for 5 mins to rest.

Step 4

Thickly slice the lamb. Serve with the vegetables and extra rosemary.