Melt the butter, chocolate, and salt in a medium heavy bottomed saucepan over low heat. Add in the sugar and milk and bring up to a boil. Lower the heat and cook for about 6 minutes, stirring constantly. Remove from heat and stir in the vanilla.
Pour into jars and store in the refrigerator for up to two weeks.
When ready to use, microwave the sauce VERY briefly to heat it up. You can either heat up individual portions, or heat the whole jar.
Nutritional information is provided as a courtesy and is an estimate only. This information comes from online calculators. Although The View from Great Island attempts to provide accurate nutritional information, these figures are only estimates.
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