In a large bowl, combine the ground beef, ground pork, bread crumbs, eggs, milk, cilantro, soy sauce, garlic powder, onion powder, salt and black pepper. Mix thoroughly with your hands or a heavy wooden spoon until combined. Form the mixture into 1 tablespoon-sized balls. Place in the slow cooker, situating them in an even layer.
In a large bowl, whisk together the brown sugar, pineapple, soy sauce, garlic, rice wine vinegar, mirin, red chile paste, cayenne pepper, onion powder, black pepper and red pepper flakes. Pour the sauce over top of the meatballs. Cook on high for 3 hours or low for 6 hours.
When finished cooking, sprinkle with fresh cilantro and toasted sesame seeds. Serve as an appetizer or over rice for a quick dinner!