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Can be coloured with 抹茶 (but it will not take on its flavour).
Mix 白あん, yolks; then add sifted flours. Beat whites with sugar, fold; then layer in mould, adding the beans. Steam for 15' on medium heat with the cloth-wrapped lid half open, then 15' with the lid closed.
In my bamboo basket it gets a bit tight, so this one is better to do in the Creuset.