In a medium bowl, stir together the rolled oats, coconut, chia, flax, salt and currants.
Pour over the milk, yogurt, vanilla, and maple syrup. Stir to combine.
Cut the apple into quarters and remove the core. Grate, skin and all, on the large side of a box grater. Add the grated apple, along with the juices, to the muesli.
Mix the muesli thoroughly, then transfer to a jar and refrigerate overnight or up to 3 days.
To serve: spoon about a cup and a half of muesli into a bowl. Thin out with a little milk or a spoonful of yogourt if desired. You don't want the consistency to be like glue, but more like porridge.
Drizzle with additional teaspoon of maple syrup, if desired, and sprinkled a few toasted almonds on top.
Heap the bowl of muesli with about a cup of winter fruits: sliced cranberries, pomegranate arils, sliced persimmon or chopped apple. Enjoy at once.