If you're not turned off by the long line up, then you're in for a treat!
I usually order a half sandwich with the london fog ice cream. I love the versatility of the ice cream flavours. Some unique flavours they have are: ube (Totaro), mango puddin'/warm coconut sticky rice (seasonal), and the seasonal bee's knees (chamomile / salted honey).
You can choose to have it in a cone, cup, Hong Kong style egg waffle, or a cinnamon bun!
If you want to avoid line ups, I would suggest going during a weekday afternoon. Otherwise, if you are greeted by a long line, and are really in a hurry, check out their fridge of pre-made sammies and tubs.