Carnitas in Crock-Pot

Sprinkle bone-in pork shoulder with salt, pepper, oregano, cumin, olive oil. 
Cover bottom of slow-cooker sleeve with sliced onion.
Cook on low for 12 hours.

Allow pork to rest 10-15 min then shred with fork.

Spread pork and cooked onions in a shallow baking dish and put under broiler to crisp up. 
Serve in corn tortillas with cotija cheese, salsa and avocado or guacamole.