Mystery Layer in Hong-Kong-Style Cakes?

(Image credit: Apartment Therapy)
And the flat white piece also had pierced holes in it, similar to biscuits…but sweet. It was almost marzipan-like, but I don’t like marzipan and I’m pretty sure it would be too flexible. Can anyone tell me anything about this type of cake and what that layer is? I hope you can help me solve this mystery!

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Editor: Readers, have you tried this type of cake, or have any idea what the mystery layer is made from?

(Image: Sura Nualpradid/Shutterstock)