Here is one I really like using the lowly bottom round roast (the bottom round roast is said to be “not worth even the little that it costs”.) I give it a good rubdown with salt, pepper and garlic powder, I sear it up in a blazing hot iron skillet and park it in the Crockpot with a couple inches of water, after 6-8 hours or so I shred it with a couple forks and put it back in the Crockpot, add a bottle of light lager or a low hop ale and half of a bottle of pace picante sauce, stir well and let it simmer for another 30 minutes. while it is reducing the liquid I taste it for seasoning and start frying up some corn tortillas into taco shells.
Fill your fresh crisp shells with the shredded beef, Mexican crema, tomatoes, and Oaxaca cheese. I like to add some fresh thin sliced and seeded jalapeño. squeeze a lime wedge over it and enjoy!
I serve right out of the Crockpot, leftovers just stay in the pot and go into the fridge.