Place onion, garlic and oil in casserole dish. Place on base of oven and cook on 600W for 3 minutes. Place all other meat sauce ingredients in casserole. Stir well.
Cover, cook on 1000W for 10 minutes. Then 600W for 15-20 minutes or until cooked.
Add mustard and grated cheese to white sauce. Cover the base of the dish with a layer of white sauce, then a layer of lasagne, then a layer of hot meat mixture. Continue with a layer of lasagne then meat, ending with a layer of white sauce. Sprinkle parmesan cheese over the top.
Place on the base of the oven and cook on Combi 4 for 10 minutes. Then Grill 1 for 3-5 minutes or until golden brown.