In a large bowl, mix the sifted icing sugar and desiccated coconut until combined.
Add the condensed milk and vanilla essence. Stir with a wooden spoon, then knead gently with clean hands until the mixture comes together like a dough.
Divide the mixture in half. Leave one half white. Colour the other half with a few drops of red or pink food colouring and mix until evenly tinted.
Press the white half evenly into a square or rectangular dish lined with baking paper.
Press the pink layer on top of the white layer, smoothing it out evenly.
Refrigerate for about 2 hours or until firm.
Once set, cut into neat squares with a sharp knife.