I think mooncakes are one of the most interesting cookies I've ever made. The recipe requires different ingredients and steps than I would usually use for baking cookies. I even needed to go to a Chinese specialty supermarket to get some of the ingredients to make these mooncakes as traditional as possible. Let's go over some of the cool ingredients: Lye water - which brings the pretzel-like color to the dough. You can either buy "lye water" or make your own using lye powder and water. Glutinous rice flour - which is important for a chewy filling. Salted duck egg yolks - (yes, what an AWESOME product) is optional, but truly gives such depth to the cookie. Last thing to mention, in order to get the identical pattern you need to get a mooncake mold (easily available on Amazon). It creates such beautiful moon cake - you won’t ever regret the purchase!