To make the syrup, add all ingredients into a small saucepan and bring to a boil. Once boiling, remove from heat, add lid and set aside to steep for two hours. Once cooled completely, pour into an airtight jar and keep in the fridge for up to two weeks.

To make the cinnamon old fashioned, add bourbon, cinnamon syrup and bitters into a cocktail mixing glass. Add ice and stir gently - chill and dilute to your own preference.

Prepare a rocks glass with a large ice cube or sphere. Strain liquid into glass and garnish with orange twist.