Mochi is a rice cake made from glutinous rice, and is used to make many of the Japanese sweets, Wagashi served with tea. Mochitsuki is the traditional process of making Mochi.
Mochi ice cream is relatively new, having started in the early 80's in Japan. It's a ball of mochi with an ice cream core available in a variety of flavors. Recently we started carrying the green tea mochi from Bubbies, a Hawaiian company. A Japanese sweet using tea; all the excuse I needed to consume a whole box. You know, for research.
The outer layer is chewy, doughy, and the ice cream, well, it's ice cream, sweet, creamy and tastes of awesomeness with a very distinct green tea profile. It tastes like they use food grade matcha, and not just powdered sencha. A unique and fun treat.