Sub Zero Nitrogen Ice Cream reopened at 4521 Kingwood Drive, Ste. 230, Houston, in February after flooding last year. The liquid nitrogen ice cream chain offers made-to-order ice cream in a variety of flavors with a number of mix-in items. The chain uses a cryogenic technique to freeze ice cream instantly. Customers choose a combination of flavors and other ingredients—fruit, candy, nuts or baked goods—and then watch as the ice cream is frozen using liquid nitrogen. 832-341-8610. www.subzeroicecream.com