In a medium bowl, whisk together the soy sauce, rice vinegar, orange juice, pineapple juice, garlic, brown sugar, onion, ginger, and red pepper flakes until combined. Reserve 1 cup for basting later.
Place the chicken wings into a large bowl or freezer bag and pour the remaining sauce over the chicken wings and place in the refrigerator for at least 2 hours or overnight for optimal flavor.
Heat a grill on medium high heat, place the chicken wings over direct heat and cook for 3-5 minutes, flip and grill another 3-5 minutes. Then remove the wings to indirect heat cover and cook 15-20 minutes or until the chicken reaches 165 degrees.
Brush the remaining marinade over the chicken wings during the last 5 minutes of cooking.
Remove from the grill and baste them one more time and season with salt if needed. Serve with any extra sauce!
Notes
I use drummies and flats but you can certainly use the whol wing of you prefer.Chicken thighs would also be great.