Combine oat milk, turmeric, cinnamon, ginger and sugar in a small pot and bring to a simmer stirring occasionally. Use a microplane to grate in the nutmeg, pretty much just eyeball it, but it’s about 1/2 a pod. Simmer just until hot.
If serving warm, add the coconut milk, apple cider vinegar and vanilla and simmer again until warm. Taste for sweetness, you might want a little extra sugar. If serving cold, you can just add those ingredients, gently mix and cool down. Then refrigerate until cold!
Serve with a cinnamon stick and more grated nutmeg just for show.