Heat the oil in a large saucepan, add the meat and fry until brown.
Add the pinhead oatmeal and fry for a further 3 – 5 minutes.
Lower the heat and add the chopped onions, carrots and garlic and cook for approx. 8 – 10 minutes.
Add the chopped tomatoes, the herbs and enough beef stock to give a good consistency. Cook for a further 10 minutes.
While this is cooking make your white sauce as follows:
Melt the butter in a saucepan on medium heat.
Add the flour and cook for 2 minutes stirring well.
Add the milk whisking all the time until sauce thickens.
Put a layer of meat sauce in a lasagne dish (approx. 32 x 22cm), followed by a layer of lasagne sheets, then white sauce and grated cheese. Repeat this layering process, finishing with white sauce and grated cheese on the top.
Bake in the oven for approx. 40min. at 180°C / 350°F / Gas mark 4.