Guyi is an institution among restaurants that serve the spicy cuisine of Hunan province. The elegant flair of the starched white tablecloths, heavy chandeliers, and mirrored walls offers an understated counterpoint to the hustle and bustle of this restaurant, which is usually fully booked. Marinated in cumin, the crispy roasted lamb chops are just one of many specialties that motivate guests to patiently stand in line until a table becomes available.