You're best bet is venture into Wheaton:
http://www.washingtonian.com/articles/diningguides/1782.html
Full key for Chinese, woomi Gardens for Korean BBQ, Irene's for papusas
For sandwiches/soup try kensington mart next to Johnson's flowers. There's also suburban trading company there for prepared stuff.
Parkway deli on grubb road, maybe this is technically silver spring
Black market bistro in garret park
There's also a few relatively new places in old town kensington--haven't tried them yet