1. Cut the onion into pieces, add 30g butter into the pot, melt and stir fry the onion into pieces until it changes color.
2. Mix the minced beef with minced pork, add egg, salt, pepper, nutmeg and bread crumbs, and mix them evenly.
3. Add the sauteed onion powder, continue to stir evenly, and finally rub it into a ball of the same size.
4. Put the remaining butter in the pot, put the meatballs that are the size of table tennis balls into the small fire and fry them, during which the meatballs must keep rolling until they turn brown, but there is still a lot of juice in the pot. This process takes about 10-15 minutes.