Add one cup sugar and two cups water to the base of a small pot.
Bring the water and sugar to a boil.
Lower the heat to a simmer and add two thyme sprigs.
Once the sugar is dissolved, turn off heat, remove sprigs, and set aside to cool.
Add one cup of blood orange juice, Tequila, St. Germain, Triple Sec, sparkling water, and cooled thyme simple syrup to the base of a martini shaker.
Add some ice and shake carefully.
Pour the cocktail into two glasses.
Top with a slice of squeezed lime, ice, and a sprig of thyme.
Enjoy!