In small saucepan, stir together sugar and 1 cup water. Cook over medium heat 4 to 6 minutes or just until sugar is dissolved. Remove from heat and stir in basil. Let stand 20 minutes. Strain through fine mesh strainer; discard basil. Transfer to jar or covered container and refrigerate until fully chilled, up to 5 days.
Make the Lemonade:
In pitcher, stir together 5 cups water, lemon juice and cooled Basil Simple Syrup. Stir until well combined. Serve over ice. Makes about 2 quarts (without optional watermelon)
To make it Watermelon Basil Lemonade, add watermelon to blender or food processor and blend until well combined. Strain liquid through fine mesh strainer and discard any solids. Before serving lemonade, stir strained watermelon juice into lemonade.
Notes
For a more pronounced basil flavor, muddle a few basil leaves in the bottom of each glass before adding the ice and lemonade.
Experiment with other herbs like thyme (or try my mint lemonade recipe) for a twist.
This website provides estimated nutrition information as a courtesy only. You should calculate the nutritional information with the actual ingredients used in your recipe using your preferred nutrition calculator.