Edible "Film" - The Chewy and Elastic Sesame Roll

Sesame roll is one of the traditional sweet cakes in Hong Kong, made from black sesame, rock sugar, and water chestnut flour. A sesame roll is usually rolled into seven circles, with each circle evenly flattened to create its chewy and elastic texture. Due to its appearance resembling old-fashioned rolls of camera film, it is also known as the "film roll." Sesame rolls were very popular in the 1970s and 1980s, and used to be seen occasionally during dim sum sessions with family and friends. However, their production process is complicated, causing them to almost disappear from the market now. Do you know where to find small shops that still sell sesame rolls?