14ouncecans of sweetened condensed milkthe number will depend on how much dulce de leche you want to make, and how many jars you can fit in the sous vide machine.
Cleansterilized (4-8 oz.) canning jars with lids. (Be sure your jars will fit in the sous vide machine and that you will be able to completely cover the top of the jar with water).
Instructions
Fill the sous vide machine with water to just below the max fill line. Begin preheating the water to 185 degrees.
Pour the sweetened condensed milk into your clean jars, leaving about 1 inch of head space. Place the lids tightly on the jars.
Immerse the jars in the water. Add more water if needed to cover the tops of the jars, but do not fill over the max fill line.
Cook for 15 hours, or until the sweetened condensed milk is thick, with a dark caramel color.
Remove the jars from the water bath and cool to room temperature. Dulce de leche will keep in the refrigerator for up to 3 months.