When he was 16, Yang Sheng-ta began studying how to make Taiwanese-style mooncakes and Japanese wagashi (traditional confectionery). In 1935 he opened Chiuyuehtang Confectionery, which became IHWA Cake Shop in 1946.
16 歲時，楊勝達跟著日本師傅學習台式月餅、日式和菓子的手藝，1935 年開設「秋月堂菓子舖」，1946 年改名為「義華餅行」。