This bistro, the more casual sibling to renowned chef Gonzalo Aramburu’s celebrated Aramburu, sits on the cusp of the edgy Constitución barrio. Have lunch at the communal table, or make a reservation for an evening of romance under the dimmed lights. Starters such as steak tartare with mustard ice cream are designed for sharing, and don’t miss the succulent lamb chops. Sommelier Agustina de Alba oversees the wonderful, well-priced wine list. Stick around after dinner for a drink at the secret new basement bar, Ünder.