Slice lemons thinly (1/4-1/8 inches) and carefully remove any seeds.
Heat 1 1/2 cups of water and 2 cups of granulated sugar over medium heat until dissolved and simmering.
Add lemon slices to the syrup and simmer for about 1 hour, flipping every 15 minutes.
Remove lemon slices from syrup and lay them out on parchment paper to dry for about 24 hours.
Coat each dried lemon slice in the remaining 1/4 cup of sugar.
Melt chocolate and dip each sugar-coated slice before letting them set on parchment paper.