Change up your barbecue chicken game this season! This homemade marinade combines balsamic vinegar, garlic, green onions, tomatoes, thyme, tarragon, basil, and a pinch of cayenne pepper.
Place chicken breasts in a single layer in a large dish. Set aside.
In a large bowl, mix together balsamic vinegar, green onions, garlic, tomato, cayenne pepper, thyme, tarragon, salt and basil. Whisk in olive oil.
Remove ½ cup of the marinade and pour over chicken breasts. Marinate for one hour on counter or overnight in the fridge. Reserve remaining marinade.
Grill chicken breasts on the barbecue on medium high or on an indoor grill, about 5 minutes or so per side (or until cooked).
Meanwhile, place the reserved marinade in a small pot on the stove and add sugar. Bring to a boil. Boil for about 2 to 3 minutes. Transfer marinade to a food processor or blender and puree. Serve sauce drizzled over chicken breasts.