For the Thyme Simple Syrup:

In a medium saucepan, combine the sugar and thyme with 2 cups water. Heat over medium heat, stirring occasionally, until the sugar has dissolved, about 2 minutes.

Remove from the heat and let the thyme infuse for 20 minutes.

Strain the syrup and let it cool. Discard the thyme leaves.

Set aside 3 tablespoons of the syrup and reserve the rest in the refrigerator for up to 2 weeks.

To Assemble:

Combine the bourbon, lemon juice, and reserved 3 tablespoons simple syrup in a cocktail shaker with ice.

Shake well and strain into a cocktail glass over fresh ice (thyme-infused optional).

Garnish with a lemon twist and a sprig of thyme. Serve immediately.