Step 1

Add butter to a heavy bottom saucepan and melt over medium heat

Step 2

After butter has melted, add the sweetener and stir constantly

Step 3

Bring the mixture a low boil and stir, stir, stir

Step 4

If the mixture reaches much more than a gradual boil, reduce heat

Step 5

Stir until mixture is a nice, dark amber brown color

Step 6

Remove from heat and stir in vanilla and salt

Step 7

Let cool for 3 minutes, stirring occasionally

Step 8

Pour into an 8 x 8 glass storage container (or similar) and refrigerate overnight, or for at least 8 hours

Step 9

The mixture will harden, but be easy enough to break

Step 10

Break into pieces and savor!