Ten second's inspiration, and twenty minute's work later, I'd saved the teacher a job.
Step 1: Materials and tools
- Mug - any old mug will do, preferably plastic in case of accidents.
- An old drink-can.
- Something sharp to cut the can.
- Some polystyrene packing (from under a frozen pizza).
- PVA glue.
- Cocoa powder.
- Something to stir the glue.
- Hot-glue gun.
Step 2: The Bulk of the Chocolate.
Make it tall enough to fill up at least half the mug, but short enough to prevent children's lips touching the chocolate too often when it's in use (to cut the risk of passing infections).
Be careful of the sharp edges.
Press the mug into the polystyrene to mark a circle for trimming. Cut out a disc that will fit snugly in the mug.
Use the hot-glue to tack the can into the mug (it wouldn't do for the hot chocolate to rattle and clang, would it?). Put a ring of hot-glue on top of the can, and then quickly press the disc into place, keeping it as level as you can.