Add tangerine juice and sugar to a medium saucepan. Bring to a boil over medium heat, stirring to dissolve the sugar. Let boil for about two minutes.
Remove pan from heat, add thyme sprigs and let cool. Refrigerate for a few hours or preferably overnight so the flavors may blend.
Before serving, remove the thyme sprigs and pour into a container or pitcher.
Add 2 to 3 teaspoons of syrup to a Champagne flute and top with sparkling wine.
Syrup keeps for 3 weeks in the refrigerator or 3 months in the freezer.
Notes
This makes enough syrup for about 32 drinks – which translates to 4 bottles of sparkling wine.
Look for freshly squeezed tangerine juice at your grocery store to make this drink even simpler to make. You can freeze a bottle if you’re not ready to make the syrup.