Dilute the light brown sugar in the water over medium heat.
Bring to a boil and cook the sugar to a caramel.
Pour the cream into the caramel and stir. The caramel may crystallise around the edges and on the bottom of the saucepan but will dissolve after a few minutes of cooking.
Add the vanilla powder and cook further for 5 minutes.Whisk the cold butter parcels to the caramel sauce.
Transfer into a glass jar and cool.
Notes
Add a splash of Whiskey, Bourbon or Cognac.
If vanilla powder is not available it can be substituted by essence.