Preheat the oven to 120oC/Gas Mark 1. Whisk the egg whites in a clean, grease-free bowl until completely stiff peaks form.
Gradually add the caster sugar, whisking until fully incorporated in between each addition.
Add your favourite food colouring and whisk.
Pop the mixture into a piping bag and, using a small open star nozzle, pipe your wreaths.
Bake for 30 minutes, then reduce to the oven temperature to 100oC/Gas Mark 1⁄2 and bake until dry and crisp, another 30 minutes or so.
Decorate with your favourite festive edible toppings and enjoy!