Combine the simple syrup, thyme, lemon and orange in a cocktail shaker and muddle together. Add the bourbon, vermouth and ice. Shake and double strain (to remove all the thyme leaves) into a lowball glass filled with ice.
This recipe was provided by a chef, restaurant or culinary professional and may have been scaled down from a bulk recipe. The Food Network Kitchens chefs have not tested this recipe, in the proportions indicated, and therefore, we cannot make any representation as to the results.