Sauce
1/2 cup dark brown sugar
1/2 cup water
1/2 cup soy sauce, preferably Japanese or reduced sodium
1/2 cup mirin (sweet rice wine), or 1/2 cup sake with 1/4 cup sugar
1/4 cup peeled, chopped ginger (I used half and it tasted like plenty to me; adjust to your preference)
1 teaspoon ground coriander
4 whole black peppercorns (no, I did not count how many I put in there)

Meatballs
1 pound ground turkey
4 large or 6 small scallions, finely chopped
Half bunch cilantro, finely chopped (about 1/2 cup) (the cilantro-averse can use flat-leaf parsley)
1 large egg
2 tablespoons sesame oil, toasted if you can find it
2 tablespoons soy sauce
Freshly ground black pepper
Vegetable oil