Matcha Green Tea?
Are there any Japanese or other places that serve traditional matcha green tea? I can't recall that Teaism servers it...
2009 R St NW, Washington, DC 20009
I know you had asked for restaurants that serve it, but it is v. easy to buy canisters of matcha powder at Japanese grocery stores and make it at home - it's usually just an "add hot water" type thing, and I use it for baking as well. Sorry that this doesn't directly answer your post but it's one option.