Place the brown sugar, full fat coconut milk, vegan buttery spread, and sea salt in a heavy bottomed saucepan.
Cook over medium low heat, stirring often, for about 6-7 minutes. Add the vanilla extract and cook for another minute or two.
Let sauce cool - it will thicken as it cools down. Serve over cake or ice cream. Store leftovers in the refrigerator.
Notes
Store leftover caramel sauce in the refrigerator. It should stay fresh for about 5 days. It will firm up in the fridge, so you do need to warm it up again before serving.