1 (3 pound) boneless pork sirloin roast (trimmed and tied with kitchen twine, if necessary)
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1 cup orange juice
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4 limes, juiced
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4 cloves garlic, crushed and divided
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1 tablespoon ground cumin
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1 ½ teaspoons coarse salt
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1 teaspoon dried oregano
Instructions
Heat oil in a large skillet over medium-high heat.
Use a sharp knife to poke 3 to 5 holes into pork roast. Stuff about half the garlic into the holes. Cook roast in hot oil to brown completely, about 3 minutes per side. Transfer roast to the crock of a slow cooker.
Blend orange juice, lime juice, remaining garlic, cumin, salt, and oregano in a blender until smooth; pour over pork.
Leave pork marinating in orange juice mixture for 10 minutes; turn roast and let other side marinate for 10 minutes.
Turn slow cooker to Low and cook for 8 hours.
Remove pork to a cutting board. Shred meat using 2 forks.
Drain liquid from the slow cooker crock, reserving 1 cup. Return shredded pork to the slow cooker crock, pour reserved liquid over meat and stir.
Cook on Low until meat is again hot, 15 to 20 minutes.