Combine garlic, onion, red wine vinegar, Balsamic vinegar, brown sugar, soy sauce, and olive oil. Mix until well combined. Set aside salt, pepper, lemon and (if using) cayenne pepper for now. If you plan on pre-marinading your chicken, pour the marinade over your roasted chicken (whole or pieces) and let sit in the fridge for a few hours or overnight. Otherwise, pour the marinade over the chicken and prepare the chicken to be roasted in the oven.

Before cooking your chicken, add salt, pepper and (optional) cayenne pepper directly to your marinated chicken. Adding the salt and pepper directly to the chicken will give it a bolder flavor versus using it in the marinade. You may want to add more or less salt and pepper depending on your personal taste. Keep the lemon juice set aside for the final step.

After removing your chicken from the oven, let it sit aside for several minutes. Then, take your set aside lemon juice and sprinkle lemon juice evenly over the chicken.