Remove the zest from the lemons. Set aside.

Juice lemons until you have 1/2 cup total fresh lemon juice.

Add juice to a small saucepan with water and sugar. Stir to combine. Bring to a simmer over medium high heat until sugar dissolves, about 5 minutes.

Remove from heat and stir in lemon zest. Let sit until cooled slightly, about 20 minutes.

Strain and cool completely before using.