People / Process / Trust
You're basically making the sauce here in bulk and poaching the first meal's worth of protein with it. How much you get out of it depends on how much you put in, but 3-4 meals of sauce and 2 meals for two's worth of protein (for example) is typical.
Into a crockpot goes:
Nestle a meal or two's worth of lean protein (1-2 lb pork loin or chicken) in with the vegetables and crockpot til the protein is fork-shreddable (2-4 hours on high).
Remove protein. Stick-blend crockpot contents into a sauce. Reduce with the lid off if necessary, or on the stove if in a rush.
Shred protein and add enough sauce for it to pull together. Salt to taste.
Tortillas + protein + extra sauce + cotija + minced (or pickled) onion + cilantro + lime makes great tacos.