Shake Shack (SHAK) may be known for serving tasty burgers and frozen custards to huge crowds at its well-known New York City locations Madison Square Park and Citifield, but it’s quietly amassing a restaurant empire overseas. ‘In the next two weeks, we will open our first restaurant in Japan in Tokyo with the people who originally brought Starbucks (SBUX) to Japan,’ says Shake Shack CEO Randy Garutti in an interview with TheStreet. Garutti added, ‘We will have some fun Japanese ingredients, the core menu of Shake Shack remains what it is -- you may see some macha (green tea) in there, you may see the best chocolate you can find in Tokyo.’ Shake Shack’s first restaurant in Japan caps what has been an active year for the better burger chain abroad. During the second quarter, Shake Shack opened its second location in the U.K. in Westfield Stratford City following a successful launch in London Jul. 2013. It also debuted a third Shake Shack in Moscow, Russia in the second quarter. Prior to the upcoming opening in Japan, Shake Shack had 29 locations overseas, with the most dominant markets being The United Arab Emirates and Kuwait – restaurants in those regions represented about 55% of the chain’s overseas spots. TheStreet’s Brian Sozzi reports from New York.