Pour the beans into a sieve, rinse with cold water and drain well. Peel and finely dice the onion.
Heat the oil in a pot. Stir-fry the minced meat for 5-8 minutes until crumbly. Add onion and fry for about 2 minutes. Add tomato paste and sauté briefly. Season with salt, pepper, 1 pinch of sugar and 1 teaspoon each of cinnamon and chilli.
Deglaze with chunky tomatoes, bring to the boil. Stir in the beans, heat up and simmer for 3-4 minutes. Season again with salt, pepper and sugar.
Wash coriander, shake dry, pluck leaves from the stems. 3⁄4 of the leaves under the chili. Serve sprinkled with sour cream and remaining coriander.