Heat granulated sugar in a medium saucepan over medium heat, stirring constantly with rubber spatula or wooden spoon. Sugar will form clumps and eventually melt into a thick brown, amber-colored liquid as you continue to stir. Be careful not to burn.
Once sugar is completely melted, immediately add the butter. Be careful in this step because the caramel will bubble rapidly when the butter is added.
Stir the butter into the caramel until it is completely melted, about 2 minutes. If you notice the butter separating, remove from heat and vigorously whisk to combine it again.
Slowly pour in heavy cream while stirring. Since the heavy cream is colder than the caramel, the mixture will rapidly bubble when added. Allow the mixture to boil for 1 minute. It will rise in the pan as it boils.
Remove from heat and stir in 1 teaspoon of salt. Allow to slightly cool down before using. Enjoy!
