The recipe was slightly more labor intensive than your average cookie, but so worth it. The only inconvenience was collecting the ingredients. It calls for 2 things that I've never worked with before: glucose and milk powder. Specialty bake stores will probably carry glucose, but I got mine from Amazon.com..they have everything!
You also need to use a European butter, they specified for Plugra, which has a higher butterfat content making it richer than American butter.
This great blog, Momofuku for 2, features other recipes. She did a post on her blueberry & creme cookies as well.
My dad surprised me by sending me a copy of Chang's cookbook when it came out. I haven't been ambitious enough to make anything (he's partial to a lot of weird and obscure ingredients..meat glue?!) but I love how it's written and the food looks great! I finally snagged a reservation at Ko for this weekend so hopefully I'll remember to bring my camera and take some photos there :)