In a heavy bottom saucepan, combine the sugar, cream, butter and vanilla extract.
Heat to a low boil, stirring with a wooden spoon.
Reduce to simmer and continue to stir until it thickens (about 5-10 minutes). Right before removing from the heat, stir in the baking soda until dissolved.
Serve immediately or allow to cool and refrigerate.
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Video
Notes
It will stay refrigerated for about a week. It also freezes well.