Add all ingredients except the sparkling wine to the glass.
3.
Stir lightly to combine.
4.
Top with sparkling wine.
5.
Garnish with a thick slice of grapefruit and a sprig of thyme.
Notes
Thyme syrup
In a saucepan, combine 4 oz. of thyme, 2 cups of water, and 2 cups of sugar and bring to a boil. Remove from heat and allow to steep for 1 hour. Strain and cool. Keeps refrigerated for a week.