1 lb. chicken wings
12 cups chicken stock
1 tbsp. toasted sesame oil
2 tbsp. finely chopped scallions, plus 1⁄4 cup, thinly sliced, for garnish
1 (1⁄2") piece ginger, finely chopped
1 clove garlic, finely chopped
1⁄2 lb. ground pork
1 tbsp. tobanjan (Japanese chile bean sauce, available at amazon.com)
2 tbsp. soy sauce
1 tsp. sugar
1⁄4 cup plus 1 tbsp. neri goma (Japanese sesame paste, available at Asian Food Grocer)
2 tsp. kosher salt
1 lb. fresh or frozen ramen noodles
Rāyu (Japanese hot chile oil, available at amazon.com), for serving