The Illusive Donut Banh Mi

I'm all for kooky local food mashups. DC's maturing local food scene would inevitably lead to such off-beat creations and collaborations, but this donut banh mi thing sounds like a true prize. Who cares about a cronut if you can put a vietnamese sandwich inside of an artisan donut? I've had both Astro Doughnuts (the coconut cake doughnut almost killed me tasty) and PhoWheels separately, I can scarcely imagine their powers combined! Now to find that PhoWheels truck again . . . and not gain 50 pounds once these things turn into my primary diet.