Belgium.

Beer is not a drink alongside Belgian food; it is a cooking liquid with a job to do. A Flemish carbonnade uses a dark abbey ale or a brown Oud Bruin for malt sweetness and a faint sourness that cuts through beef fat, and the cook balances it with brown sugar and a slice of mustard-smeared bread stirred into the pot to thicken and sharpen the sauce. Lambic and gueuze, spontaneously fermented in the Zenne valley outside Brussels, turn up in kidney and duck dishes where their acidity does the work vinegar would elsewhere. Cook with a hoppy modern IPA and the sauce turns aggressively bitter — this is the one substitution Belgians will genuinely argue about.

The second pillar is the potato, and specifically the frite. Belgium invented the double fry as a matter of routine: a first bath around 150°C to cook the potato through without colour, a rest, then a second bath at 175–185°C to blister the outside into glass. Traditionally the fat is beef tallow (ossewit or blanc de boeuf), which gives the savoury note that distinguishes a Belgian frite from a French fry, and the potato is a Bintje — floury enough to go fluffy inside. Frites are not a side dish so much as the default accompaniment to everything: mussels, vol-au-vent, steak, stoemp, even a stew that already has potatoes in it.

Dairy and eggs do the thickening. Waterzooi is finished off the heat with egg yolk beaten into cream, added after the boil is over so the broth turns silky rather than scrambled. Vol-au-vent leans on a butter-and-flour roux enriched the same way. Stoemp is potato crushed with vegetables and enough butter to make it glossy. Cheese appears mostly as a gratin topping — aged Gouda-style cheese, Emmental or a local abbey cheese melted over endive and ham.

The vegetable canon is small, seasonal and northern: witloof (Belgian endive, forced in the dark so it stays pale and only faintly bitter), leeks, carrots, celeriac, Brussels sprouts, salsify, white asparagus in spring served à la flamande with crushed egg and butter. Bitterness is not hidden but softened, usually with sugar, ham or fat.

Regionally the country splits. Flanders cooks in butter and beer and looks to the North Sea for shrimp, sole and mussels. Wallonia is closer to French country cooking with cured Ardennes ham, game, trout and pungent washed-rind cheeses. Brussels sits between them and claims both, plus its own street food and the sugar-heavy pastry tradition — speculoos, cramique, and two entirely different waffles that outsiders insist on treating as one.