Peel, wash and slice the potatoes. Cover with cold water and put aside. Wash the cucumber, put 4 slices aside for garnishing. Cut remaining cucumber lengthwise, remove seeds with a spoon.
Coarsely grate cucumber halves, mix with quark and yoghurt. Wash the chives, dab dry and cut into fine rolls, except for something to garnish. Stir the chives into the quark except for a little bit for garnishing, season with salt and pepper.
Peel and finely chop the onion. Knead minced meat, onion, eggs, breadcrumbs, some salt, cayenne pepper and cinnamon. Cut feta cheese into 16 pieces. Shape the minced meat into oval dumplings with moistened hands and press a piece of feta cheese into the middle of each.
Wash the sage and dab dry. Put 2 meatballs with 2 sage leaves on each skewer. Heat 3-4 tablespoons of oil in a large pan and fry the skewers for 6-8 minutes, turning them over.
Warm up finished skewers. Clean the pan and heat 3-4 tablespoons of oil. Fry the potatoes for 15-20 minutes until golden brown. Wash the rosemary, dab dry and pluck coarsely into pieces. Shortly before the end of the frying time, add to the potatoes and fry.
Season the finished potatoes with salt and pepper and arrange on plates with the minced meat skewers. Put the cucumber-quark dip in 4 bowls and garnish with the remaining chives and one cucumber slice each, sprinkle and add.