Yuzu is a Japanese citrus fruit that is very floral and aromatic, in the same profile as passion fruit. Both are very intense, present flavors, but they are clearly distinguishable even when they are together. The main flavor in this cake is yuzu, with passion fruit lending a secondary role. The green tea génoise is meant to add an herbal note that surrounds both flavors without overwhelming them. The hibiscus adds a note of acidity and a very floral flavor that surrounds the other components of the cake to enhance their flavors; it can be very powerful, which is why it is used in such small quantities in this cake.
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