To achieve the traditional pink and white effect, make two separate batches of coconut ice, colouring the second batch pale pink and pouring it on the set white mixture.
Lightly grease a 20 x 15 cm (8 x 6 inch) shallow tin.
Slowly dissolve the sugar in the milk. Bring to the boil. Boil gently for 10 minutes or until the mixture reaches 116 °C (240 °F) on a sugar thermometer. Remove from the heat. Add the coconut.
Spread half the mixture into the tin. Colour the remainder pink and pour over the first layer. Cool, then mark into 2 x 2.5 cm (1 x 1 1/2 inch) pieces. Cut when cold.