Fry the onion, beef and herbs for 5 minutes. Add the tomatoes and cover and cook for 10 minutes adding the kale for the last 3 minutes.
Place two sheets of lasagne in an ovenproof dish, top with half the mince. Place 2 sheets of lasagne on top then the remaining mince. Add the final 2 sheets of lasagne. Pour over the cheese sauce and sprinkle over the cheese.
Bake for 30-35 minutes until golden. Serve with a fresh green salad.