3 slices white bread crusts removed, cut into cubes. About 2 cups
¼ cup milk
4 tbsp butter, divided
½ large onion, grated using the large holes of a box grater
1 large egg
¾ lb ground beef
½ lb ground pork
1 tsp salt
1 tsp black pepper
½ tsp freshly grated nutmeg
½ tsp ground cardamom
For the meatballs