Pound chicken to 1/2" thickness and place in freezer bag.
Combine lemon juice, zest and spices in a mixing bowl and mix well.
Add marinade to freezer bag and marinade at least 4 hours (overnight is preferable).
Preheat grill on high.
Place chicken on grill and cook until done (should take between 5 and 10 minutes), flipping at least once.
Serve with Greek Salad.