Soak the dry bun in warm water. Peel the onion and cut into fine cubes. Put the minced meat and diced onion in a bowl. Add the firmly squeezed bun with the egg to the minced meat mixture and mix everything well with a fork. Season the mixture with salt, pepper and nutmeg.
Heat the oil in a pan and form small balls from the minced meat mixture. Press these flat and fry in hot oil or fat for 10-15 minutes. Put on a board and let cool.
Drain the pineapple slices well and cut them into pieces that match the meatballs. Place a meatball on each piece of pineapple and secure with a toothpick. Wash and dry the grapes. Then skewer on the toothpick.