In a small saucepan on medium-high heat, melt the butter. Stir the brown sugar into the melted butter until it is smooth.
Reduce the heat to medium and stir in the coconut milk until it is smooth. Remove the sauce pan from the heat and stir in the vanilla and salt.
Let the caramel sauce cool and thicken for about 20 minutes. Slice one whole apple per person and dip the slices into the caramel sauce. Enjoy!!
Notes
Cool to Thicken: The caramel sauce will thicken as it cools. All it to cool to room temperature so you don't burn your tongue, and so it's thick enough to stick to the apples.
Coconut Milk: Don't use light or low-fat coconut milk, which will make your caramel sauce too runny.
Storing: Store cooled caramel sauce in an airtight container in the fridge for up to 2 weeks.