First, you need to make the Bolognese sauce. To do this, heat the frying pan and pour in the olive oil. Crush the garlic cloves with the flat side of a knife and throw them in the frying pan, fry for 1 minute. The oil should be saturated with the taste of the garlic. Throw in the ground beef and fry it for 5 minutes over medium heat. Salt and pepper it.
When the mince is half-cooked, add the tomato sauce. Pour in half a glass of clean water. Stir. When the liquid boils, reduce the heat and cover with a lid. Leave the Bolognese sauce to simmer for 20-30 minutes.
While the bolognese sauce is cooking, prepare the second sauce – béchamel. To do this, melt the butter in a saucepan (ladle) over low heat.
Add flour and stir with a wooden spatula for 1-2 minutes. The flour should combine with the melted butter and turn into a golden plastic mass.
Pour in the milk and stir until the flour dissolves. Lightly salt and pepper the sauce. Cook it on low heat for 5-7 minutes. The béchamel should thicken a little. Remove from heat and cool. In the end, you should get a creamy sauce with the consistency of liquid sour cream.
Now you need to assemble the lasagne. Grease the baking dish with butter or vegetable oil. Pour some béchamel sauce on the bottom.
Depending on the size of the dish and the number of servings, place the pasta sheets on top of the béchamel in one layer.
Spread a thin layer of Bolognese sauce over the pasta
Sprinkle grated cheese on top.
Pour the béchamel sauce over everything again and repeat the layers listed above.
On average, you should get 4-5 layers. Make the top layer as follows: put the pasta sheets on the grated cheese, pour the béchamel sauce over it and sprinkle with grated cheese again.
Place the lasagne in the oven to bake for about 30-40 minutes. Cut the finished lasagne into portions. Enjoy.