Preheat the oven to 180°C (160˚C fan). Measure the butter, plain flour, cornflour and caster sugar into a food processor. Whizz until combined. Tip out and knead lightly to form a soft dough and chill for 10 minutes.
Roll out and stamp out 16x8cm rounds. Place on baking sheets and chill for a further 20 minutes. Bake for about 15 minutes (they will spread a little). Leave to cool.
To make the icing, whisk the royal icing and half of the water in a free-standing electric mixer until the icing is thick and shiny.
Add the glycerine and whisk again. Add the rest of the water 1tbsp at a time until the mixture is the consistency of thick yoghurt.
Put the cookies on some non-stick paper. Spoon over the icing so it drops off the edge of the cookies to look like melted snow. Place a marshmallow at the edge of each one.
Push a Tic Tac into the marshmallow for a nose, draw on eyes with black writing icing and place fizzy strawberry strip scarves around the marshmallows. Use three Mini Smarties for buttons.
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