Whisk together the 1/2 cup yogurt, the juice from 1/2 lemon, lemon zest, olive oil, garlic, paprika, herbes de Provence, 1 teaspoon salt, and black pepper in a bowl. Pour into a resealable plastic bag. Add chicken, coat with the marinade, squeeze out excess air, and seal the bag. Marinate in refrigerator for at least 3 hours.
Preheat an outdoor grill for medium-high heat, and lightly oil the grate.
Combine 1/2 cup yogurt, 1 tablespoon lemon juice, and harissa in a small bowl. Set aside.
Remove chicken from bag and transfer to a plate or baking sheet lined with paper towels. Pat chicken pieces dry with more paper towels. Season with pinch of salt.
Grill chicken, skin-side down, on the preheated grill for 2 minutes. Turn each piece and move to indirect heat.
Grill, turning often, with lid down until well-browned and meat is no longer pink in the center, 30 to 35 minutes. An instant-read thermometer inserted into the thickest part of the thigh, near the bone should read 165 degrees F (74 degrees C).
Serve chicken with the yogurt harissa mixture on the side.
Aluminum foil helps keep food moist, ensures it cooks evenly, keeps leftovers fresh, and makes clean-up easy.
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