Yeah, get the Grainassance brand. It's so awesome! I made the mistake of getting mochi from a japanese store and it wound up being a dessert with bean paste inside...not the kind you want. You want the kind from Whole Foods. It's the best.
HAHAH Yes... Mochi is also made into an ice cream like dessert at some Japanese food places. It's almost the same thing, made from rice, but its ice cream...so be careful of what you buy! But the dessert is also AMAZING if you are a flirt and want to try it! But i am not sure if it contains milk or not!