Sticky Butterbeer Caramel Chicken Wings

Name: Sticky Butterbeer Caramel Chicken Wings
Ingredients: 2 tablespoons minced cilantro stems; 2 cloves garlic, grated; 1 teaspoon grated ginger; 2 tablespoons fish sauce; 1 tablespoon sugar; 1/2 teaspoon ground coriander; Kosher salt and freshly ground black pepper; 3 pounds whole chicken wings (about 14), split at the joints between the flat and drumette, tips left on; Neutral oil, such as canola or vegetable oil, for frying; 3/4 cup all-purpose flour; 1/3 cup cornstarch; 3/4 cup sugar; 3 tablespoons cold unsalted butter; 1/4 cup fish sauce; 1 tablespoon oyster sauce; 2 cloves garlic, minced; 1 small red chile pepper, such as Fresno or red jalapeño, seeds removed, pepper minced (see Cook’s Note); 2 tablespoons lime juice; 1/2 teaspoon butterscotch extract; 2 tablespoons coarsely chopped cilantro leaves, plus more on top for garnish; 1 small red chile pepper, such as Fresno or red jalapeño, thinly sliced on the bias; Lime wedges, for serving