In a large resealable plastic bag, combine the marinade ingredients.
Discard all the visible fat from
the chicken. Put the chicken with the smooth side up between 2 sheets of plastic wrap.
Using a tortilla press, the smooth side of a meat mallet, or a rolling pin, lightly
flatten the chicken to a thickness of ¼ inch, being careful not to tear the meat.
Add to
the marinade. Seal the bag and turn to coat. Refrigerate for 30 minutes to 8 hours,
turning occasionally. Discard the marinade.
Preheat the grill to
medium-high.
Grill the chicken for 6 to 7 minutes on each side, or until no longer pink in the
center.
To serve, garnish with the lemon
slices and sage leaves, if using.