Belgian Meatballs in Liège Syrup Sauce

Steps

1. In a large bowl, combine minced beef, minced pork, chopped onion, crushed garlic, egg, breadcrumbs, mustard, parsley, salt, and pepper. Mix well.
2. Shape the mixture into meatballs. For a traditional serving, make them large; for quicker cooking, keep them smaller.
3. Heat oil or butter in a large pan over medium heat.
4. Add the meatballs to the pan and brown them evenly on all sides until they have a nice crust.
5. Once browned, remove the meatballs from the pan and set aside.
6. In the same pan, melt 1 tablespoon of butter.
7. Add the sliced onions and cook until they become soft and lightly caramelized.
8. Sprinkle in brown sugar and allow it to melt into the onions.
9. Deglaze the pan by adding white wine vinegar, scraping up any browned bits from the bottom.
10. Stir in mustard and Liège syrup, combining well.
11. Pour in beef stock (and beer if using) and add the bay leaf.
12. Mix until the syrup is fully dissolved and the sauce has a glossy appearance.
13. Return the meatballs to the pan, cover, and let them simmer gently for 25-30 minutes, stirring occasionally to thicken the sauce.
14. Adjust the taste of the sauce as needed: add more syrup for sweetness, more vinegar for tanginess, and extra mustard for depth. The final sauce should be sweet-sour, rich, and velvety.
15. Serve the meatballs with fries or mashed potatoes for a complete meal.