In a pan, on medium heat, melt the butter and add the olive oil.

While it melts, cut the carrot in small cubes, and same for the onion

Add the onion and the carrot to the pan and stir the vegetables for 2-3 min

Then cut (or blend) the meat and add it to the pan until it becomes white and a bit yellow

Boil the water and then add the tomato sauce and the cut tomatoes

Add the water with the tomatoes and tomato sauce to the pan

Add salt and pepper and then place a lid on the pan, and let the sauce on low heat for 35 min

While we wait for the sauce to finish, we start making the bechamel sauce.

Melt the butter in a pan, and when it's fully melted, add the flour and mix

Preheat the oven at 180° Celsius

Take the pan off the heat and slowly add the milk while mixing, then add some salt and pepper

When the sauce finishes, take your lasagna tray and add a lair of lasagna sheets, then a lair of Bolognese sauce, then a lair of bechamel sauce, and finally, a lair of grated parmesan. Repeat the process until you are out of sauces.

Place the tray in the preheated oven for about 35minutes or more (until the parmezan on top becomes crunchy)

Take it out and, finished! Delicious lasagna, done!

Enjoy!