Preheat your oven to 180 degrees C.
Spray the bottom of your baking dish (32 cm x 24 cm) with non-stick spray.
First make the Bolognese sauce by heating the olive oil in a large pan.
Add the onion, carrots and celery and sweat for 10 minutes on low heat until the onion is soft.
Take the veggies out of the pan and put aside.
In the same pan fry the mince meat until done and crumbly.
Put the veggies and garlic back into the pan.
Add the oregano, thyme, chopped tomatoes, tomato paste, red wine and stock cubes and mix well.
Season with salt and pepper and simmer for 15 minutes. You might have to add some water if the sauce gets too dry.
While the Bolognese sauce is bubbling away, you start with the Béchamel sauce.
Melt the the butter in a large sauce pan on medium heat before you incorporate the flour with a whisk. This flour and fat mixture is called roux.
Keep on whisking while you add half of the milk, the salt, pepper and nutmeg.
You have to keep on whisking to avoid the sauce from burning.
When the sauce starts to thicken, you can add the rest of the milk, still whisking continuously.
Once the sauce starts to bubble and has a thick consistency, it is ready. Check the seasoning again before you start assembling your lasagne.
Cover the bottom of your baking dish with a little bit of the Bolognese sauce. Then start with a single layer lasagne sheets, followed by Bolognese sauce.
Pour a thin layer of Béchamel sauce over the meat sauce, followed by a layer of lasagne sheets. Press the lasagne sheets carefully down to compress the layers slightly.
Repeat the layers until you have used all the sauces and pasta sheets. The top layer should be Béchamel sauce covered with the grated mozzarella cheese.
Bake the lasagne for 30 to 35 minutes and enjoy.