There is a Costa Rican restaurant called Irazu, on Milwaukee in Chicago that has this Oatmeal shake that I have been trying to figure out for awhile now. Does anyone know how to make this amazing shake?? It seems like it would only be a few simple ingredients like: cooked oatmeal, vanilla, soy milk, sugar (possibly agave nectar), cinnamon and ice. But that's not working, and neither are any of my other guesses. Here's a couple photos of my favorite things there. The garlic Yuca which is so full of flavor and crispy, like a french fried potato.
(click on "Irazu" for the menu").
I just found this!----> "The only hint I got about making one though was through this blog Big Sweet Tooth, who also wrote about the wonders of Irazu's oatmeal shake, and in passing suggested there has to be some horchata in it (sweetened spice-infused rice water)."