By An Edible Mosaic
Prep Time: 2 min
Cook Time: 8 min
Add the butter to a medium-sized saucepan over medium heat. Once melted, stir in the brown sugar, salt, and cream of tartar.
Cook until the sugar is melted and the mixture is boiling, about 1 to 2 minutes, stirring occasionally.
Carefully add the cream (it will bubble up), and stir to combine. Let it boil for about 3 to 5 minutes until it’s thick enough to coat the back of a wooden spoon, stirring occasionally.
Remove from the heat and stir in the vanilla. It's ready to use!