PRESS BUTTER SAND TOKYO STATION SOUTH PASSAGE Pop-up is a dessert pop-up inside the gates of the south passage at Tokyo Station, selling cookies sandwiched with butter cream. Flavors include original, cheese, matcha, strawberry chocolate, and cherry blossom, with butter cream or caramel cream between crisp cookies. Entering the shop requires passing through the ticket gates, it opens early in the morning, and the checkout line can take about 15 minutes when it is long. Each purchase comes with one paper bag, which is not a brand-specific bag.