Place the chicken in a large Ziploc bag. In a small bowl combine olive oil, lemon juice, vinegar, garlic, oregano, basil, thyme, coriander, salt, and pepper. Pour the mixture over the chicken making sure all the chicken has been covered.Place the bag of chicken in the fridge to marinate for at least 30 minutes. Also, don’t let the chicken sit longer than 2 hours because it will start to break down and become very slimy!Before you thread your chicken skewers preheat the Weber SmokeFire Grill to 325 degrees. Next, take the Weber stainless steel skewers and thread the red onion, zucchini, and chicken breast on to a skewer. Repeat the process until all the skewers have been filled.Place the skewers on the grill and insert the Weber probe into the chicken. Cook the chicken for about 10 to 20 minutes flipping halfway through or until a the chicken reaches 165 degrees. Once cooked, remove from the grill and place on a plate with tzatziki sauce and all your favorite garnishes!