Traditional Steam Egg Cake by Sharon Foo

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Recipe: https://kwgls.wordpress.com/2014/02/08/back-to-traditional-recipe-of-1egg%EF%BC%9A1sugar%EF%BC%9A1flour-traditional-steamed-sponge-cake-%E5%8F%A4%E6%97%A9%E5%91%B3%E9%B8%A1%E8%9B%8B%E7%B3%95%EF%BC%89/