Prepare the Marinade
Zest one lemon to get 2 teaspoons of zest and set it aside.
Juice both lemons to measure 1/4 cup.
In a small bowl, whisk together tahini, lemon juice, soy sauce, garlic, and 2 tablespoons of water until smooth.
Marinate the Chicken
Pour all but 1/4 cup of the marinade into a large bowl.
Add the chicken cutlets to the bowl and toss to coat evenly.
Cover and refrigerate for at least 30 minutes and up to 4 hours.
Store the reserved marinade in the refrigerator for serving later.
Cook the Chicken
Heat olive oil in a large skillet over medium-high heat.
Remove chicken from the marinade, brushing off excess, and place it in the skillet in a single layer.
Cook for about 5 minutes, flipping often, until browned on both sides and cooked through.
Deglaze the Pan
Add 1 to 2 tablespoons of water to the skillet.
Stir and scrape the bottom to release the flavorful browned bits.
Toss the chicken in the liquid until evenly coated.
Serve
Transfer the chicken to a platter and sprinkle with the reserved lemon zest.
Garnish with parsley if desired, drizzle with reserved marinade, and serve with lemon wedges.