Amazing Caramel Sauce

Recipe yields 1 1/2 cups 

1 cup packed brown sugar
1/2 cup heavy cream
4 tablespoons butter
Pinch of sea salt
1 tablespoon vanilla extract

Melt butter in pot, mix in brown sugar, cream and salt.
Cook over medium-low heat and whisk gently
for about 7 minutes or longer if you doubled.
I remove the pot from the heat, add vanilla and return to
cook for another minute or so to thicken a bit more.
Take it off the stove and pour into a jar then pop it into the
fridge.