In a saucepan, add in the strawberries and granulated sugar. Place over medium heat and let it heat for about 13 minutes until the sugar is dissolved and a bright red syrup has formed. The strawberries will become pale and broke down.
Strain out the strawberries and any pulp using a fine mesh strainer. Pour the syrup into a pitcher.
Add in 1 cup of fresh lemon juice. It took 5 large lemons to equal a cup of lemon juice for me.
Add 4 cups of cold water into the pitcher. Stir to combine.
Refrigerate until chilled. Serve!
You can adjust the sugar to your taste. If you like it more tart, feel free to leave out sugar.