While preparing the seasonings, preheat the slow cooker on high
In a small bowl combine the chicken broth, balsamic vinegar, sesame oil, soy sauce, garlic powder, ground ginger, and black pepper. Stir until blended.
Add the pork loins to the slow cooker and pour the soy mixture on top.
Replace lid and turn the slow cooker down to low heat. For very tender pork loin, allow cooking for 6 hours (or less for a firmer texture).
Optional - About 15 minutes prior to serving, using a ladle, remove as much of the liquid from the slow cooker as you can and place in a pot.
Optional - On high heat, allow the liquid to reduce in the pot until dark brown and slightly thicker.
Remove the pork from the slow cooker and slice. Place in a large bowl.
Optional - Drizzle the reduced liquid onto the pork.