Peel and chop the onions. Wash mint, shake dry, chop finely except for a few leaves. Knead with minced meat, half onions, egg and breadcrumbs. Season with salt, pepper, cinnamon and coriander.
Fry the remaining onion cubes in 1/2 tbsp. hot oil. Add bulgur and fry briefly while stirring. Add a good 1/4 l water, tomatoes and stock. Bring to the boil and simmer for about 15 minutes, stirring occasionally.
Form approx. 12 balls from the chopping mass with moistened hands. Heat 1 tablespoon of oil in a large frying pan. Fry the balls in it for about 10 minutes until golden brown.
Crumble the feta and finally add it to the bulgur. Season the bulgur with salt and pepper. Serve with the meatballs. Garnish with the rest of mint.