Mike Yen's career as a mixologist began with a blow to the head. Several, actually: "I played soccer for UC San Diego, and ended up getting four concussions in a season. I started bartending as a way to make sure I was keeping my memory sharp." As soon as he made it behind the bar, the creative juices started flowing; alcohol-infused foam gave way to egg-shaped shots and Cognac waffle cones.

By the time he first got ahold of some liquid nitrogen, there was no going back to the field.

"I found that I really loved it, I really loved working with people, and it really allowed me space for artistic expression. My mantra now is to give people a great experience. I want everyone to leave happy, with memories they'll come back for."

After a few years trying to keep up with the quick turn-over in large bars, he struck out on his own as a private mixologist, planning adventurous edible cocktails for parties. We sat down with Yen recently to talk about quirky customers, worm fungus mixers, and the lure of smoking drinks.