Buffalo & Bergen - sells bagels and knishes. I rarely eat bread so I tried a collard knish. All I can say is that collard greens don't make a knish taste better.
DC Mediterranean - mediocre middle eastern food. I had their falafel, kibbee and various pies.
Rappahannock Oysters - excellent oysters at a decent price. Also tried their lamb and clams - decent for the price.
RIS - expensive small bowl of rather bland curry goat stew.
DC Empanadas - fancy empanadas flavors that I don't like.
Spices and Tea shop - both way overpriced.
After several trips to Union Market, my conclusion is that it ain't worth the time and effort for me to get there.