Place the chicken in the ziplock bag, squeeze out any air and seal. Then, use a meat mallet to pound the chicken so that it’s an even thickness throughout.
Add in the zest of 1 lemon plus the juice of the lemon into the bag. Add in the garlic, herbs, mustard, honey, olive oil and salt.
Press any air out of the bag and reseal it. Use your hands to mix everything together by smooshing it around in the bag.
Allow the chicken to marinate for at least 20 minutes or up to a couple hours.
Prep the grill as needed with oil (depending on your grill) and heat the grill to a medium/high heat. Place the chicken onto the grill and cook for a few minutes on each side until nicely grilled with a good char.
Once the chicken in cooked through, place it on a plate for a few minutes so that the juices inside the chicken settle before cutting.
If serving whole, squeeze some fresh lemon over the chicken and a sprinkle of sea salt and serve. If adding to the salad, cut the chicken into slices and squeeze the lemon and sea salt over the cut slices.