Wash and dry the lemons, then zest them, avoiding the white pith.

In a large glass jar, combine lemon zest and vodka. Seal and let infuse in a cool, dark place for 2 weeks; shake gently every few days.

After 2 weeks, make simple syrup by dissolving sugar in heated water. Let it cool.

Strain the lemon-infused vodka into another jar to remove zest.

Combine the strained vodka with cooled simple syrup, adjusting sweetness to taste.

Transfer to decorative bottles and refrigerate before serving chilled.