Whisk the eggs on a low speed at first, turning up the speed gradually to medium, beat the egg whites until stiff peaks form. Add 250g of the sugar 1tbsp at a time mixing well after each addition. Divide the meringue between 4 bowls and very gently fold into each, a few drops from one of the food colouring gels. Using a spatula, spread each mixture into a template on the baking sheets. Bake for 45 mins then leave to cool in the oven.