A lot of lemon and frequently a pinch of dill add a little twist to the Italian dishes prepared by Master Chef Jean-Georges Vongerichten. Appetizers such as homemade ricotta, olive oil, and strawberry compote, along with crispy pizza with wild mushrooms and delicate risotto balls, draw people to the recently opened Mercato. Architects Neri&Hu turned the 6th floor of “Three on the Bund” into an eatery that combines industrial elegance with farmhouse style—as unadulterated as the ingredients that melt on the tongue.