Tucked away in One Commerce Square, behind a lit courtyard and fountain, Twenty21 is one of the city’s best-kept fine dining secrets. In an atmosphere of refined elegance and attentive service, Four Seasons-trained chef Townsend Wentz brings an inspired sense of ingredient pairings and a sure hand with sauces to his frequently changing menu. Dishes such as a meaty roasted turbot “T-boneâ€...