On the Mid-Autumn Festival in 1981, Guo Yuan-yi was the first to package the egg yolk pastry in gift boxes, causing a buying frenzy. The crowd that used to rush to Guo Yuan-yi's store to buy ice-cream filled pastries also eagerly snapped up the egg yolk pastries. This enthusiastic response created a stir, adding a wonderful story to Taiwan's pastries. By 1983, egg yolk pastries had become wildly popular throughout Taiwan, becoming a well-known local delicacy. In 2012, Guo Yuan-yi broke with tradition and innovated by incorporating a soft, crumbled egg filling into a rich mung bean paste, creating the perfect balance for the fillings. Paired with an outer layer made with fresh cream, the pastries are filled with a rich egg aroma and a melting inner filling, leaving behind a lingering aftertaste. This evocative flavor brings back memories and is a testament to the dedication of Guo Yuan-yi, a century-old local bakery, to preserving the authentic taste of the region.