Moules-frites (mussels and fries) are Belgium's national dish. It consists of steamed mussels in a white wine and herb sauce, served with a side of thick-cut french fries. This dish is often enjoyed as a casual meal or as a late-night snack.
Belgian waffles are a type of waffle that is made with a yeast-based batter and cooked in a special waffle iron that creates a deep-pocketed waffle. Belgian waffles can be served plain or topped with a variety of sweet or savory ingredients, such as fruit, whipped cream, chocolate sauce, or cheese.
Other popular traditional Belgian dishes include:
Carbonnade Flamande (Flemish beef stew)
Stoemp (mashed potatoes with vegetables)
Waterzooi (fish stew)
Stroopwafel (caramel waffle)
Speculaas (spiced cookies)
I hope this helps!