Sheng Kee is a Taiwanese bakery chain founded in Taipei, Taiwan. It looks like they’re based in the SF Bay Area now, with stores in San Francisco, Foster City, Richmond, Berkeley, Union City, Milpitas, and Cupertino. (I’m not sure if they still have any locations in Taiwan.)
My mom and I picked up a black sesame mochi pastry. Sheng Kee also has green tea red bean pastry, sweet potato mochi pastry, and taro mochi pastry.
The black sesame mochi pastry has a flaky crust, with black sesame paste filling, and mochi center. The mochi center reminded me of the dessert soup with mochi balls filled with black sesame paste.