Clean, wash and peel the cucumbers, cut them in half lengthwise and remove the seeds with a tablespoon. Cut the flesh into pieces. Peel and finely dice onions. Peel garlic and chop very finely.
Wash the fish, dab dry and dice very finely. Mix fish, egg, 1/4 of the onions, half of the garlic, lime juice and breadcrumbs. Season with salt and pepper. Heat 2 tablespoons of oil in a frying pan, fry the cucumbers in it, add the rest of the onions and garlic, fry briefly and deglaze with broth.
Bring to the boil, braise at low heat for about 12 minutes. In the meantime form 8 meatballs from the fish mixture. Heat 2 tablespoons of oil in a frying pan, fry the meatballs for 3-4 minutes at medium heat.
Wash the dill, dab dry and cut finely. Mix yoghurt, sour cream and dill. Season with salt and pepper. Serve braised cucumber vegetables, meatballs and a dollop of dill yoghurt cream on plates.
Garnish with lime slices and dill flags. Baguette tastes good with it.