4 whole-wheat hamburger buns, split and toasted, if desired
1 tsp. rice vinegar
1 tsp. low-sodium soy sauce
1 tsp. honey
⅓ cup low-fat mayonnaise
1 tbsp. extra-virgin olive oil
4 leaves napa cabbage
¼ tsp. ground pepper
1 tsp. fish sauce
¾ cup chopped kimchi (see Tip), divided
1 cup sliced scallions, divided, plus 8 whole scallions, trimmed
1 pound ground pork