Place all of the ingredients into a medium size saucepan and do not stir

Place onto a medium heat and leave until the milk begins to bubble

Remove from the heat and change the heat to the lowest setting

Stir well with a wooden spoon, skim off the foam and place back on the heat

You will need to give this a good stir every 15 minutes for 3 hours, skimming each time you stir

When the dulce de leche is thick enough to stick to the back of a wooden spoon remove from the heat

Set aside to cool completely before placing into a sterilized glass jar

Store in the fridge and use as needed