With its pale green walls and gold framed mirrors and prints, parquet floor and wall-length banquette, Chez Billy Sud could only be French. That’s how it seems to me anyway. (The green hue of the walls reminds me of the gift boxes used by the Parisian tearoom and macaron shop, Ladurée, which coincidentally recently opened a location in Georgetown, at 3060 M St. NW). The Provencale cuisine seals the deal, satisfying the hankerings of francophiles with steak frites, seared duck breast with sour cherries, escargots, and sautéed trout with capers. A courtyard offers additional seating in fine weather and also leads to Chez Billy’s sidekick wine bar, Le Bar a Vin, equally charming with its exposed brick walls, dark-stained wood floor, and copper-topped bar.