Instructions
- Mix milk and sugar in a large sauce pan on a medium-high heat. (The sauce will bubble up so it needs to large enough so it doesn't froth over)
- Add the cinnamon stick, salt, and vanilla extract. Bring to a boil whilst constantly stirring. This will take about 15 minutes – you must watch carefully or it will boil over!
- Once the milk boil and froths up, remove from the heat and add baking soda to the pan. The mixture will froth, bubble, and grow- just keep stirring well.
- Place the pot back over medium heat and stir often, at least every 10 minutes. Keep the milk at a gentle simmer. Stir well, especially scraping the bottom of the pan so it doesn’t catch. Adjust heat as needed.
- After about an hour the milk with start to turn golden brown. Remove the cinnamon stick.
- The caramel will start thickening, keep stirring as the longer you cook the thicker it will be.
- Once the sauce is thick enough to coat the back of a spoon, remove from the heat and allow to cool. Put in an airtight container and it is will last for a week in the fridge.