Under the Sea Cookies


Everyone’s got their favourite undersea character – mermaid, fish, seahorse, shark, starfish, octopus or turtle – and our huge range of cutters help you stamp out a whole shoal of fishy friends. Ice, decorate, sprinkle and munch the bunch!
Made using our Under the Sea Cookie Cutters, Wilton® Colour Right System, and Unicorn Sprinkletti Mix.


For the cookies

  • 100g butter, softened
  • 75g caster sugar
  • 1 egg yolk
  • 200g plain flour
  • 1-2 tbsp milk

For the royal icing

  • 15g egg white
  • 455g icing sugar
  • 75g water

To decorate


  1. Preheat the oven to 200°C/Gas 6. Lightly grease 3 baking trays. Place the butter and sugar in a bowl and cream together until light and fluffy.
  2. Separate the egg yolk from the white and set the white aside. Beat in the egg yolk. Sift in the flour and mix well with enough milk to give a fairly soft dough.
  3.  Knead the mixture gently on a lightly floured surface and roll out to 5mm thick. Cut into your chosen cookie shapes, place on the prepared baking trays and bake for 8-10 minutes.
  4. To make the royal icing, first sieve the icing sugar into a bowl. Add the egg white and combine gently. Add the water and mix with a spoon until combined. Using an electric mixer, mix on low for up to 15 minutes until you have a nice light texture.
  5. To colour your icing, first mix colours in a ramekin or small bowl, then add small amounts using a cocktail stick to achieve the colour you want – you will need approx. 2 tablespoons of royal icing to 2-3 touches from a cocktail stick. We used the following number of drops from the Wilton Colour Right System:
    Blue: 4 x blue
    Lilac: 6 x red, 2 x blue
    Jade green: 8 x blue, 4 x yellow
    Pink: 8 x red, 1 x blue, 6x pink
  6. Pipe the outline on the biscuits using a disposable piping bag fitted with a piping tube.
  7. When the outline has dried, let down your icing by adding a few drops of water until it has the consistency of thick yoghurt. Spoon the let-down icing into a piping bag, snip off the tip to make a very small hole and fill in the middle of your icing design. Use a small decorating brush to help spread it to the edges and remove any air bubbles. Leave to dry completely unless you’re adding sprinkles to the wet icing.

Decorating tips

Mermaid – ice the face, arms and middle first and leave to dry, then ice the rest. Add sprinkles to her tail when the icing is wet. When fully dry, paint on her face using a black edible food pen

Turtle – add sprinkles to the wet icing to make the shell.

Shark – pipe on the teeth and eye using white icing.

Seahorse – pipe a wavy snail trail from its head to tail and three little dots in rows on its fin. Attach tiny pearls and stars to this icing then paint on eyes.

Starfish – stick a large pearl from the sprinkles in the middle, then pipe small dots of white icing along the centre of each arm.