2 cups water
1 + 1/2 cups granulated sugar
1/2 cup packed light brown sugar
3 tsp vanilla essence
In a saucepan on medium-high heat, stir everything other than the vanilla.
Boil until all the sugar has dissolved, about 5 mins.
Remove from the heat and mix in the vanilla essence.
After cooling, transfer to a glass jar and store in fridge.