New York City — A new London-based ‘flexitarian’ plant-based restaurant concept financially backed, in part, by actor Leonardo DiCaprio, is opening a pop-up in Urban Space at 230 Park Avenue in Manhattan. The new pop-up location for Neat Burger is giving New Yorkers the chance to try its acclaimed menu items ahead of its first official location opening later this year — all part of the company’s recently-announced rapid expansion plan to launch Neat Burger locations across the U.S., with the support of strategic investors DiCaprio and Lewis Hamilton. Established …