Chez Léon is in the middle of the rue des Bouchers, a street in in central Brussels that's filled with mediocre restaurants. But don't pass by this big, bustling restaurant, which has been feeding locals and visitors since 1893. The best reason to eat here is the choice of mussels. Whether you want them gratinéed with snail butter, deep-fried with tartar sauce, raw with a mustardy Marolle sauce, or just accompanied by cream or white wine, this is the place. The rest of the menu is long, with traditional meaty dishes like rabbit stewed in kriek beer, Brussels-style dumplings, and fillet of horse meat, in case you're curious about what it's like. The fish menu is even longer: monkfish with green pepper sauce, sole, salmon, and croquettes all make an appearance. The wine is reasonably priced; there's a very respectable beer list (and the house beer is excellent). The waiters move fast as they dispense the riches of the sea. You can sit outside in summer, but it can get pretty crowded, so indoors is usually best.