- Combine apple cider, soy sauce, garlic, gochujang (or cayenne pepper) and green onion in a medium mixing bowl. Whisk to combine. Reserve ½ cup of marinade and set aside. Pour remaining marinade over chicken wings in a large shallow dish. Refrigerate at least 2 hours up to 8 hours.
- For the glaze, whisk cornstarch with reserved ½ cup of marinade in a saucepan. Heat to a simmer over medium-low heat. Continue to simmer for 3-5 minutes, until marinade thickens. Remove from heat and cool the glaze at room temperature.
- Preheat grill to medium heat and grease grill grates. Remove chicken wings from marinade and pat dry with paper towel. Discard marinade. Place wings on grill and cook for 15-20 minutes, flipping wings halfway through cooking.
- Remove wings from grill and toss with the glaze in a large bowl. Garnish with green onion and serve.