Pour the water into a blender. Add the cilantro, onion, jalapeño, garlic, allspice, and salt. Blend until smooth and set aside.

Line the bottom of the slow cooker with a layer of aluminum foil, then place the banana leaf on top. Season the pork with salt and place it on the banana leaf. Pour the blended mixture over and around the meat, then add the bay leaves.

Cover the slow cooker and cook on low for 8 hours.

After cooking, remove the meat, discard the bones, and chop the meat on a cutting board.

Assemble the tacos.

Top with salsa verde.