Method
Simmer the syrup
Bring blueberries, sugar and 1 cup water to a simmer. Mash the berries and cook 8 minutes.
Infuse
Remove from heat, add basil and steep 10 minutes.
Strain
Press the mixture through a fine sieve into a pitcher and discard the solids.
Finish
Stir in the lemon juice and cold water. Taste and add water or sugar to your liking.
Serve
Chill at least an hour, then pour over ice with extra basil.
Sweeten to taste
Berry sweetness varies. Taste before chilling and adjust, since cold dulls sweetness slightly.
Times are averages from our test kitchen. Always cook to safe internal temperatures. Read our disclaimer.