Mitsuwa in New Jersey is the largest Japanese grocery store in the United States. They have an amazing food court that includes ramen, tempura, soba, and gyoza shops. You can also find incredible wagashi at the Minamoto Kitchoan counter.
The summer Umaimono food festival vendors are starting to set up inside Mitsuwa and one of the first ones I saw was this matcha green tea frozen yogurt stand. There is one combo that includes a mini slice of matcha cheesecake!
If you walk down the candy aisle, you will find a giant wall of green tea Crunch bars and Kit Kats!