Irazu is a funky little Costa Rican joint on Milwaukee Ave. whipping up the most incredible oatmeal milkshakes that you've ever tried. Though they won't give away the secret (of course), I have a sneaking suspicion that bad boy has a base of horchata (a milky Mexican drink made from rice & almonds). They will cop to not using any ice cream at all, just 2% milk for the creamy, slightly icy consistency. Sprinkled with cinnamon and loaded with tiny bits of ground oatmeal, this is one of the best treats going. Seriously, who needs ice cream?