Cook the pasta in plenty of water according to the instructions on the packet until al dente and drain, catching some pasta water and setting it aside.
Finely dice the bacon and leave it in a saucepan over low heat.
Peel the onion and the clove of garlic and chop very finely. Sweat in the bacon fat. Add the minced meat and fry until crumbly. Add the tomato paste and fry briefly. Dust everything with flour, sweat and deglaze with vegetable stock.
Carefully pour in the collected pasta water, stir in tomato ketchup to taste and bring to the boil. If the sauce gets too thick, add a little pasta water, if it gets too thin, work with ketchup.
As soon as the desired consistency is reached, the noodles are added, stir briefly once and serve.