In a heavy 3-quart saucepan, melt the sugar and water over medium-high heat. Whisk constantly until the sugar is dissolved.
Once the sugar mixture reaches a low boil, stop whisking and allow the mixture to continue boiling until it reaches a medium-dark amber color. This step can take a while, but be sure to watch the mixture carefully: if you step away, this is where it could burn. Every once in a while, swirl the pan to ensure even boiling. [img src="https://urbanblisslife.com/wp-content/uploads/2014/02/Salted-Caramel-Sauce-Boiling.jpg"]
As soon as the sugar mixture reaches that dark amber color, take it off the heat and immediately add the butter. Whisk briskly until the butter melts completely. [img src="https://urbanblisslife.com/wp-content/uploads/2014/02/Salted-Caramel-Sauce-Smooth.jpg"]
Slowly and carefully pour in the heavy cream and whisk to combine. The mixture may bubble as you whisk, which is normal.
Keep whisking the mixture until it is a gorgeous, luscious caramel sauce.
Pour the caramel sauce into glass jars to cool, uncovered.