Make the brown sugar syrup

• Combine the brown sugar and water in a small saucepan.
• Warm over medium heat, stirring until the sugar dissolves into a smooth, glossy syrup.
• Do not let it boil; it should only lightly simmer.

Add the vanilla

• Remove the saucepan from the heat and stir in the vanilla extract.

Whisk in the dairy

• Whisk in the half-and-half and milk until smooth.

Store

• Pour into a jar or bottle, seal and refrigerate.
• Shake before each use; keeps fresh for up to 10 days.