A French-style bistro, Bouchon ("cork" in French) serves simple French comfort food such as escargot in garlic butter, steak frites, bouillabaise, and a version of chicken cordon bleu. Monday to Wednesday all-you-can-eat mussels nights ($17) draw a crowd. The house private-label wines, from France, are a good value. The owner is French and the restaurant is popular (in part due to its prime location on Lexington Avenue). In good weather, a little courtyard at back is a pleasant place to sit. Next door, under the same management and open daily for lunch and dinner, is Crêperie Bouchon. It serves lighter fare in a charming courtyard, with the same all-you-can-eat mussels nights.