Boil the potatoes. Either you serve them as mashed potatoes or boiled.
Mix the milk and the heavy cream together with the bread crumbles, and the spices. Let it all rest for 10 minutes.
Mix the onion with a mixer so it all like a puree.
Mix the minced beef and the egg in a bowl, and add the onion and the bread crumble mixture and stir it well.
Roll small balls and place them on a big plate.
Melt 1/4 of the butter in a frying pan and fry half of the meat balls. and repeat with the rest of the meatballs.
Melt the rest of the butter in the frying pan and add the flour while stirring.
Add the cooking cream, water and the soy sauce and let the sauce get thicker.
Serve the meatballs together with the sauce the potatoes, and the lingon berry jam.