Preheat the oven to warm (lowest setting). Line a large rimmed baking sheet with parchment paper and set aside.
Wash the lemons and pat them dry. Remove zest from each lemon with a citrus zester. A good zester will remove all the yellow and none of the bitter white layer.
Evenly spread out the zest on the sheet pan, and place it on the middle rack in the oven. After 20 minutes, remove pan from oven and toss to make sure zest is drying evenly. Return the pan to the oven for about 25-30 minutes until thoroughly dried, then remove from the oven.
Increase the oven temperature to 425°F. Add the dried lemon zest to a spice grinder, coffee grinder, or small food processor. Add the salt and black peppercorns. Grind ingredients until thoroughly blended. Taste test and add additional salt and pepper if needed.
In a large bowl, toss the chicken wings with olive oil and 1-2 tablespoons of lemon-pepper seasoning.
Place the wings in a single layer on rimmed baking sheet without overcrowding them. (If desired, line with parchment paper for easy clean up, and use a wire rack on top of the baking sheet for extra crispy wings). Bake for 20-25 minutes. Turn wings over and bake another 20-25 minutes. Remove from the oven and let them rest for a few minutes.
Serve with sliced celery and your favorite dipping sauce, if desired. Ranch or blue cheese are great options!