Place the gin, lemon juice, honey syrup, thyme leaves and 3 dashes of orange bitters into a shaker. Lightly muddle the thyme leaves, add large ice cubes and shake vigorously. Strain into a coupe glass, garnish with remaining thyme sprig and serve.
In a small saucepan over medium heat, heat the honey and water until incorporated and the honey has dissolved. Cool to room temperature before using.