In a medium saucepan, combine the water and sugar.

Place the saucepan over medium heat and stir until the sugar completely dissolves, about 3-5 minutes.

Remove the saucepan from heat and add the fresh mint leaves.

Cover the saucepan and let the mixture steep for about 30 minutes.

Use a fine mesh strainer or cheesecloth to strain the syrup into a clean bowl or jar.

Stir in the lemon juice.

Allow the syrup to cool to room temperature before transferring it to a glass jar.