In a cocktail tin, combine first three ingredients with ice and shake. Strain into a white wine glass, top with sparkling wine, and garnish with orange peel.
In a saucepan over medium heat, combine all ingredients except sugar. Bring mixture to a simmer, add sugar, and whisk until dissolved. Let simmer for 45 minutes (mixture should reduce slightly), then strain and cool.
From Pop, Fizz, Clink