For the best cheesecake in New York, you have to go to Brooklyn. Junior’s Deli on Flatbush makes a creamy pie that is the stuff of legend and fantasy. The cheesecake made at Junior’s is one of the few American foods that can be credited as a completely American invention; its essential ingredient is rich cream cheese, which was invented in the 1870s by American dairy farmers who were attempting to recreate a French Neufchatel cheese.