Toasted ham and cheese with quality ingredients. It’s a tasty marriage of sweet sugar and salty ham, crisp toast and melty cheese.
Best one I made was when staying in Antwerp. I got the cheese in Amersdam - a truffle gouda. Butter was also dutch, from memory, but I can’t recall exactly. Nice and salty. Bread was local - Suikerbrood. Sweet bread that browns easily. Ham was prosciutto from France somewhere.
Have to put the butter on the outside and pan-fry slowly to ensure the cheese melts. The If you don’t have a sweet brioche bread, sprinkle sugar on the butter to get that crisp, sweet exterior.