Puerto Rican Shredded Pork

I saw this in the November 2013 issue of Better Homes and Gardens.  It's in a pork ad.

2-3lb boneless pork sirloin roast, trimmed and tied with kitchen twine if necessary
1 tbsp. vegetable oil
4-5 cloves garlic, skins removed, crushed
1 tbsp. cumin
1/2 tbsp coarse salt
1 tsp. dried oregano
4 oranges, juiced or 1 C. freshly squeezed orange juice
4 limes, juiced

Poke 3-5 holes in pork with sharp knife; stuff with half the crushed garlic,  Warm oil in large skillet over medium high heat.  Add pork and brown on all sides, 6-8 minutes.

Combine remaining ingredients in blender and blend 3-5 seconds until evenly combined.  Place pork in slow cooker, pour liquid mixture over pork and let marinate about 10 minutes on each side.

Turn slow cooker on low; set timer for 8 hours.  After 8 hours, remove pork and shred using two forks on large cutting board.  Remove from all liquid from slow cooker except 1 C. and add pork back to pot.  Let cook another 15 to 20 minutes.

Serve shredded pork in lettuce wraps or in corn tortillas. Top with pico de gallo, chopped cilantro and avocado.