Set Microwave to 'Oven' and preheat to 200°C.
Cut potatoes and drizzle with olive oil, salt and pepper.
Cut garlic. Slit lamb rack and gently and insert garlic pieces.
Sprinkle salt, pepper and rosemary leaves, then rub in olive oil.
Pop lamb rack and potatoes onto grill tray and into the Microwave.
Roast for 30-40 mins at 200°C.