Costanera, surely the most exciting new restaurant in New Jersey, will beguile you. This is one of those oh-so-humble-and-nonchalant places that turn around and stun you with a crisply executed vision of cuisine. The kind of place that takes off its sunglasses to reveal a celebrity. That celebrity is Juan Placencia. Remember his name because you’ll be able to say you knew him back when. Placencia is a sort of culinary Benjamin Button, a chef who starts with an ancient cuisine and gives it youthful luster, a young and earnest chef who startlingly possesses the poise and expertise of a much more seasoned kitchen soul.