Clean your large mixing bowl thoroughly to ensure there's no grease.
Add the egg whites, caster sugar and peppermint essence and whisk on medium for 2-3 minutes, it will have doubled in size and become foamy.
In the medium sized mixing bowl combine the icing sugar and cornflour.
Add a heaped tablespoon of the sugar mixture and whisk again on medium for 30 seconds.
Repeat this process until all the sugar mix has been used.
Turn up the whisk to high and beat for another 2-3 minutes until thick and glossy. The meringue should form a peak when you lift the whisk out of the bowl and not fall back down.
Put stripes of red food colouring on the inside of your piping bag and fill about 2/3 with meringue.
Twist the top of the piping bag to close and pipe small circles onto lined flat baking trays. Lift the piping bag up quickly to create a peak on the top and give a "Hershey's Kiss" look.
Continue until all the meringue is used, putting more red colouring on the piping bag if necessary.
Allow the meringues to rest 15 minutes before baking.
While they rest, preheat the oven to 105°(220°f).
Once the meringues are rested, bake for 20-25 minutes or until they lift cleanly off the baking tray.