To marinate the meat or chicken of your choice, combine pear (or apple), onion, soy sauce, sugar, sesame oil, and garlic in a food processor and blend until smooth. Combine with sliced scallions, sesame seeds, red pepper flakes, and black pepper in a sealable container, taste and adjust seasonings. Add the meat you choosing and massage in the marinade. Seal the container and refrigerate overnight, or at least one hour.