Cover the roast completely with cumin, ensuring all parts are coated. You may not need to use all of it. Set roast in CrockPot
Pour in jar of salsa, making sure to NOT completely cover it. It should not be drowing the roast, but just basically filling up the empty space around the roast. Add beef broth (and optionally beef bouillon)
Set CrockPot to high and let cook for 3 to 4 hours
Heat vegetable oil in frying pan. Quickly cook (3 - 5 seconds per side) the corn tortillas. Sprinkle lightly with salt directly after removing from oil.