Preheat your oven to 375 F. Peel the sweet potatoes and cut into 1/2 x 2 inch sticks, set aside. If you have the whole wings, separate them by cutting into pieces. Slide your index finger under the skin behind the middle bones of the winglets and slide in 1 to 2 of the sweet potato sticks and continue until you are done with the rest of the chicken and sweet potatoes (you may have few left overs of the sweet potatoes)
Line a baking sheet with aluminum foil. Place the stuffed chicken wings onto the baking sheets and brush with some grape seeds oil. Bake until cooked through and golden brown, about 45 minutes or longer. The sweet potatoes won't be as crunchy compare to if you deep-fry them, but it still taste good
While the chicken is baking, prepare the sauce by combining all the sauce ingredients and cook it in a small sauce pan until the sugar dissolves
When the chicken is cooked, arrange on a serving platter and drizzle the sauce over and garnish with spring onion and serve immediately
Notes
The sauce is great for other stir-frying meat dishes as well