Delmonico's, located just a few blocks away from the New York Stock Exchange in downtown Manhattan, opened in 1837 as one of the first sit-down restaurants in America. 

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But while the restaurant is perhaps best known for its steaks, it also has a selection of food items you won't find on the menu. Called the "Secret Billionaire's Menu," these dishes will set you back quite a bit — there's a grilled cheese sandwich for $100, for example, and a golden twist on the classic black-and-white cookie for $50. 

"We have a lot of Wall Street guys down here and they're always looking to outdo one another," Executive Chef Billy Oliva told Business Insider.

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We recently got to try out the menu in person — here's what it was like. 

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