Pour the oil into a wide pan and let it heat up on low heat.
First add the smoked bacon and fry it briefly.
Then add sliced red onion and then garlic.
Stew everything for about 10 minutes.
After that, add the grated carrot and the sliced celery stalk, and simmer for an additional 10 minutes while stirring.
Add the meat and break it into smaller pieces and stir until it loses its light color.
Stew for 10-15 minutes to evaporate the water released by the meat.
Salt and pepper.
Add the tomato paste and stir briefly, then pour in the pelats.
While everything is mixing, gently cut them in half or chop them into several pieces.
Add water, mix everything well and cook for an hour to reduce the liquid.
Towards the end of cooking, taste the Bolognese again and season it with salt and pepper if necessary.
About half an hour after adding the water, heat the spaghetti water in a separate bowl on the stove.
When it boils, add salt and cook the spaghetti according to the instructions on the package.