Preheat oven to 450ºF or a grill or grill pan over medium-high heat.
In a large mixing bowl, whisk together the EVOO, zest and juice of 1 lemon, garlic and black pepper. Season the chicken well with salt and toss into the bowl. Marinate the chicken for 15 minutes.
If roasting, place a large, cast-iron skillet over medium-high heat with 2 turns of the pan of EVOO, about 2 tablespoons. Sear the chicken, meat side-down until golden brown, about 5 minutes, then turn over and transfer the pan to the oven. Roast until cooked through, about 15 minutes.
If grilling, grill chicken until marked and cooked through, 8-10 minutes per side.