Onions peel and cut into cubes. Wash, clean and dice the tomatoes. Wash the meat, dab dry and cut into fine cubes. Heat 2 tablespoons of oil in a frying pan one after the other.
Brown the meat in 2 portions. In between, loosen the meat with stock, drain and put aside. Return meat of the first tour. Add onion and fry for approx. 3 minutes. Put tomato cubes into the roasting pan and braise.
Pour back the dissolved frying medium. Season with salt, chiles and sugar. Braise for approx. 45 minutes in a closed roaster at reduced heat. Pour beans into a sieve and rinse with water. Add the beans 10 minutes before the end of the cooking time.
Arrange chili con carne on plates.