COOK IT.
Start by preheating your pellet grill to smoke mode, around 250 °F.
In an aluminum pan, or grill-safe container, combine the sugar and water.
Allow the water and sugar mixture to smoke for 45 minutes-1 hour until it becomes a thick simple syrup. Remove from the grill and set aside to cool.
Increase the grill's temperature to 400°F
Cut all of the lemons in half and place the cut side down directly over the flame broiler. Allow the lemons to grill for 5 minutes, or until they have deep grill marks. Remove from the grill and allow to cool for 5-10 minutes.
Juice the lemons until you have about 2 cups worth of juice.
In a pitcher, combine the simple syrup and lemon juice. Stir to combine.
Top off the lemonade with sparkling water or club soda.
Chill until ready to serve. Pour over ice and enjoy!