1. In a large pan heat the oil and cook the onions until softened, add the beef mince and cook until brown.
2. Add the stock, tomatoes, herbs and garlic and simmer gently.
3. Make white sauce by warming milk to nearly boiling and then adding cornflour to thicken
4. Construct the lasagne by putting a third of the meat sauce in a tin/dish and then cover with a layer of lasagne, repeat twice more.
5. Pour the white sauce all over the top and then cover with grated cheese. Bake in the oven at 180’C for approx. 40 minutes until brown on top and lasagne feels soft when fork inserted.