Add your sucanat (or organic sugar) to a medium sauce pan, along with the butter.
Turn to medium heat and cook and stir this until the sucanat melts completely and it turns into a thick liquid.
Cook without stirring now for 5 – 10 minutes over medium heat (it should be bubbling), until the mixture reaches the softball stage.
You’ll notice that the edges that are bubbling up are slightly browned — the sugar is caramelizing a bit. That’s okay. Make sure the heat isn’t too high or it will burn, and quickly.
Test the mixture in a small bowl of cold water to see if it holds together loosely. This is how you know it is at the softball stage. You can also use a candy thermometer and check to see if it reaches about 235 degrees.
Remove from the heat briefly and stir in the cream all at once. This is going to be weird…because the cold cream will make the sugar seize up for a bit. Keep stirring…as the cream warms up, it will come together.
Now it is basically a liquid. Return it to the heat and allow it to come to a boil. Because of the high sugar content, it won’t curdle.
Boil for 10 minutes without stirring. It will be thickening now into an actual “sauce.”
Remove from the heat and allow to cool slightly. Add the vanilla and the sea salt, a little at a time, tasting until it’s how you want.