A stalwart for business lunches since the days of the Mexican Revolution, is there any reason Bellinghausen needs to change? The old-school refinements include rib-sticking steaks, seafood, and Mexican standards, served in generous portions; delightful garden seating (in addition to the clubby nostalgia of the front dining room); and what some say is the chop-choppiest service in all Mexico City. It’s a mix that keeps the restaurant’s high-end clientele exceedingly happy. More importantly, what comes out of the kitchen is always fresh and expertly prepared; you never sense the chefs are resting on their laurels. In the heart of the now-tatty Zona Rosa, lunch at Bellinghausen offers a glimpse of the neighborhood’s mid-20th-century heyday, when the surrounding blocks were the most bohemian and fashionable in all Latin America.