The simple syrup base is just a way of dissolving the sugar, which won’t dissolve well in cold water. You can easily multiply the recipe for bigger batches of lemonade (highly recommended!). Keep any extra simple syrup on hand in a jar in the refrigerator for homemade lemonade on-demand!
Combine the sugar and 3/4 cups of the water in a medium saucepan and bring to a boil over medium-high heat. Once the liquid reaches a boil, reduce the heat and simmer for about 5 minutes. Remove from heat and add the lemon juice and fresh mint. Give the syrup a quick stir and set aside to steep and cool for at least 30 minutes.
Strain the syrup into a bowl, measuring cup or jar and discard the mint.
In a large pitcher, combine the syrup with 4 cups of cold water and plenty of ice. Serve in iced glasses with sprigs of mint.