Over medium heat on the stove, use a pot and heat up the butter and coconut milk.

After the coconut milk + butter has heated up (not boiling yet), add in the coconut sugar + vanilla extract.

Whisk frequently to prevent burning on the bottom of the pot. Mix well.

Once it comes to a boil, turn it down to low/med heat and keep it at a low boil for 5 minutes.

Take it off the heat and let it cool down. It will thicken as it cools down.