What you need:
565ml full cream or semi-skimmed milk
2 tablespoons good-quality drinking chocolate
Sugar, optional to taste
How to make:
First put the milk into a pan. Bring to a simmer-not a boil- and while it is heating, put a tablespoon of choco powder and sugar, if using, into each mug. Add a little warmish milk from the pan to each mug- you just need enough to dissolve the chocolate powder, At this point, plonk a few marshmallows into each mug. When the milk is at a simmer, carefully pour it into a plastic jug or flask. I normally do this over a sink as it always ends up spilling a bit
Screw the lid on tightly, place a cloth over the lid for safety, and shake hard for a minute. Remove the lid, minding the steam, and pour the milk into your mugs. A little stir, and you can slurp your way to heaven.