To prepare the lemon-pepper seasoning, wash the lemons and pat dry. Remove zest from each lemon with a microplane. While doing so, collect as much of the flavorful yellow outer layer as possible, while avoiding the more bitter white layer below.
Spread the zest in a thin layer on the parchment paper and place in the oven. After 20 minutes, remove pan from oven and shake to make sure zest is drying evenly. Return to oven until thoroughly dried, approximately 25-30 minutes.
Remove dried lemon zest from the oven and increase oven temperature to 425°F.
Add dried lemon zest to spice grinder or food processor along with salt and black peppercorns. Grind ingredients until desired consistency is reached. Taste and adjust ratio of salt and pepper as desired.