In a food processor place the Onion, Oregano, Garlic, Lemon Juice, Lemon Zest, Salt, and Olive Oil
Blend until the mixture looks like a paste
Pour the marinade over the chicken. (We place the chicken in a ziploc bag and pour the marinade over it. You could also use a bowl.)
Cover the Chicken completely with the marinade
Marinate the chicken in the refrigerator for at least one hour up to four hours
Place the chicken on skewers (this can be done before adding the marinade)
Place the chicken on the grill. Use tongs to rotate the chicken as each side is done. Will take about 3 or 4 minutes per side, depending on how hot the grill is.
Flip the chicken to get a nice grill mark on all sides. Don't force the chicken to flip. When It's ready it will easily flip over with tongs.
When the chicken is done serve it with your favorite sauce We used Tzatziki Sauce
Notes
The Chicken can be placed on skewers prior to marinating.