In a medium saucepan over medium heat, combine demerara sugar and water. Stir until sugar has dissolved. Do not let boil. Remove from heat and let cool completely.
Store in a mason jar for up to one month.
Rum Old-Fashioned
In a mixing glass filled with ice, combine rum and Demerara syrup.
Use a bar spoon to gently stir the mixture until chilled.
Strain into a rocks glass with a large ice cube. Top with a dash or two of bitters, to taste.
Garnish with a piece of orange zest.
Notes
To make a non-alcoholic Rum Old-Fashioned: Use a zero-proof rum and non-alcoholic bitters.If you don't have Demerara sugar: Use brown sugar, turbinado sugar or granulated white sugar to make your simple syrup.