Preheat oven to 220°C. Line baking tray with baking paper. Place pumpkin pieces on prepared tray and bake in oven for 40 minutes or until tender and golden. Reserve.
Rub lamb with oil and season with freshly ground black pepper. Heat frying pan and cook lamb over high heat for 4-5 minutes on each side or until cooked to your liking. Scatter with dried oregano. Place on warm plate and lightly cover with foil. Rest meat for 10 minutes before slicing.
Place couscous in a bowl and pour over 1 cup (250ml) boiling water. Soak for 2 minutes, fluff up with a fork. Boil, steam or microwave broad beans until hot. Peel off outer skin if desired. Fold into couscous. Keep warm.
Place tahini in mixing bowl. Add lemon juice and stir to combine. (if the tahini is very firm, add 1-2 tbs of boiling water to loosen it). Stir in yoghurt and garlic.
Combine roasted pumpkin with chopped parsley, mint, green shallots, tomato. Whisk together the oil, lemon juice, mixed spice and cracked black peper. Gently toss through salad.
Thickly slice lamb and drizzle with tahini sauce. Serve with bean couscous and pumpkin taboulli.
Don't cut the lamb with a knife to test if it's ready. This will make the juices escape making the meat dry and tough.
Test the meat for degree of doneness with tongs. Use the blunt end of the tongs to prod the meat in the thickest part.
Rare is soft when pressed, medium firm when pressed and well done is very firm when pressed.