We tried the ultra-decadent secret 'billionaire menu' at Wall Street's oldest steakhouse that features a $100 grilled cheese

Just a few short blocks from the New York Stock Exchange, another Wall Street institution sits at its centuries-long perch at the triangular intersection of William and Beaver streets.

Delmonico's is widely considered to be one of the very first sit down restaurants in America, born at a time when New York offered little more than taverns and oyster cellars. Culinary mainstays like eggs benedict and baked Alaska were invented in their kitchen.

While Delmonico's is (rightly) renowned for its steak offerings, Executive Chef Billy Oliva tipped us off to several decadent items that aren't on the printed menu. Skip the dining room and head straight to the bar to ask the bartender for these secret items like a $100 grilled cheese or a $50 cookie.

Delmonico's is celebrating its 180th anniversary in September in style, offering a 180-day dry aged steak for a whopping $380.