Belgium has a long tradition of chocolate making.

Belgian chocolate couverture and baking chocolate are characteristically more buttery, medium sweet with medium bitterness.

Chocolatiers think of Belgian chocolates as being in the middle range of flavor profile with not too much of a range in flavor extremes.

Belgian milk chocolate for example has a classic milk flavor and not so much fruitiness or sourness you might find in other milk chocolate varieties.

Belgian dark chocolate will have a classic fudge like earthy flavor and no sourness, fruitiness or lingering floral flavors usually.

The popularity of the Belgian chocolate taste is because it is comforting and forward without too many distractions.