Boing Boing's Weekend of Wonder in association with Baby Tattoo was tremendously fun. One of the many highlights of the 3-day event was a tricked-out coffee station that we set up on Saturday morning. I brought my Rancilio Silvia espresso machine with a retro-fitted PID temperature control system and pulled about 75 shots in on hour. John Edgar Park brought a device that carbonates beverages and used it to make fizzy cold brew coffee. He also brought a little sack of xanthan gum (a food thickening agent), which he mixed into coffee using an immersion blender. It was really good!
Above, a video from ChefSteps with the recipe for a xanthan gum latte.