Coat the slow cooker with nonstick cooking spray. Add the pork (in a single layer if possible), turning the pieces cut-side up.
5 pounds boneless pork loin roast
In a small bowl, mix the teriyaki sauce, rice vinegar, red pepper flakes (if using), and garlic.
⅔ cup teriyaki sauce, ¼ cup rice vinegar, 2 teaspoons red pepper flakes, 5 cloves garlic
Pour the sauce over the pork.
Cover and cook on LOW for 8 to 9 hours.
Transfer the pork to a bowl and shred with two forks.
Add the peanut butter to the liquid in the slow cooker and stir until it dissolves.
½ cup creamy peanut butter
Return the pork to the slow cooker and toss until the meat is well-coated in the sauce.
Garnish each serving with scallions, nuts, and a squeeze of lime.
½ cup scallions, ¼ cup cashews or peanuts, 2 limes