Take as many slabs of white chocolate as you like - I used 5 bars of the Basic white chocolate from Sainsburys which are only 30p per bar.
Melt them however you like , microwave is fine, in a jug. Grab a 10 pack of peppermint candy canes ( 99p from Sainsburys ) .
Stick them in a thick plastic bag and arm the children with a rolling pin.
Stand well back as they bash the living daylights out of them.
Sprinkle a layer of the crushed canes onto a baking sheet lined with greaseproof paper. Pour the white chocolate on top , sprinkle with the remainder of the crushed candy canes and bung it in the fridge.
This is the worst part - you have to wait a while whilst it all hardens. When it's well and truly solid whip it out of the fridge and let the children smash it to pieces. I defy anyone one to make this and not eat it all in one sitting . I would have taken a photo of the finished product ... but it's all gone !