It’s pretty easy to find heavy, meat-filled foods in River North. More of a challenge is discovering delicate, fresh seafood, like the kind at GT Fish & Oyster. Ask a local to suggest a great upscale spot for seafood that’s not sushi in Chicago, and this usually tops the list. Overall, the food is seasonal, simple, and meant to be shared, with decadent choices like fish and chips, a lobster roll, and mac and cheese with lobster, along with healthier options such as whole roasted fish, a crudo platter, tuna poke, oysters, and caviar service. At lunch, you can get a number of dinner menu items as well as sandwiches and shared plates, and GT serves a decadent brunch on weekends.