tomatillo black bean and barley

1/2 lb tomatillos (cut in half, probably about 10 medium tomatillos)
1/4 onion (large dice)
1 clove garlic (whole)
large handful of cilantro (maybe 1/2 of a bunch)
1/3 of a Serrano pepper (can omit or add more, next time I'd add 1/2)

1 cup barley
2.25 cups water
1 can black beans (drained)

~1 tsp salt

Make tomatillo salsa by pureeing tomatillos, onion, garlic and cilantro in a food processor.  Add to slow cooker.  Add barley, water and black beans to slow cooker.  Mix and cook on high for 2 hrs.

adapted from http://www.365daysofcrockpot.com/2013/09/recipe-for-slow-cooker-tomatillo-quinoa.html