Here’s how it all goes down: you can get liquid base of your choice (whether it's regular cream-based ice cream, dairy-free fro-yo, custard, whatever), and a huge selection of additional flavors and toppings. It gets thrown in a bowl together, and then liquid nitrogen is poured over the mixture and stirred until it freezes solid. So there are almost infinite combinations of bases, flavors, and add-ins. You can literally have whatever kind, flavor, and size of frozen treat you want, out of the same shop, all thanks to that huge tank of nitrogen by the door. The Mass Ave location makes it a great treat for a day out on the town.