Bring the hibiscus flowers, sugar and 1/2 cup water to a boil in a small saucepan. Reduce the heat to medium and simmer, stirring, until the sugar is dissolved, about 2 minutes. Transfer to a small bowl and refrigerate until chilled, at least 1 hour or overnight.
Strain the hibiscus syrup into a liquid measuring cup, reserving some of the flowers for garnish. Combine the gin, lemon juice and 1/4 cup of the hibiscus syrup in a small pitcher. Stir in the tonic. Add more hibiscus syrup to taste.
Fill 4 glasses with ice. Pour in the cocktail and garnish with the reserved hibiscus flowers.
Tools You May Need
Photograph by Linda Xiao
Courtesy of Food Network Magazine
Tools You May Need
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