Shamrock St. Patrick’s Day Cake by Siúcra & Catherine Fulvio


Celebrate St. Patrick’s Day the right way with Siúcra x Catherine Fulvio’s delicious lemon and lime Shamrock St. Patrick’s Day Cake!

This perfect companion to the celebratory day helps get the festivities off to a great start, with it’s refreshing lemon curd, and punchy lime buttercream.

Topped with some festive decorations, this is sure to be a show stopping dessert!

Serves 10 to 12


For the lemon lime curd

  • 2 limes, juice and zest
  • 2 lemons, juice only
  • 180g Siúcra Caster Sugar
  • 120g butter
  • 4 egg yolks

For the cake

  • 180g Siúcra Caster Sugar
  • 180g unsalted butter, softened
  • 7 eggs
  • 380g plain flour
  • 2 tsp baking powder
  • 100ml milk

For the butter cream:

  • 250g butter, softened
  • 550g Siúcra Icing Sugar
  • 2 limes, juice only
  • Green food colouring
  • Black food colouring


  • Siúcra roll out icing, to make shamrock cut outs and a leprechaun hat
  • Cut a 15cm heart shaped template from baking paper
  • A large cake board
  • A piece of green or white ribbon for around the board


To make the curd:

  1. Place all the ingredients into a saucepan over a low heat and stir most of the time until a thick curd forms.
  2. Remove and leave to cool completely.

For the cake:

  1. Preheat the oven to 180°C/Fan160°C/gas 4. Brush 3 x 18cm cake tins with melted butter and dust with flour.
  2. Cream the Siúcra Caster Sugar and butter until light and fluffy.
  3. Whisk in the beaten eggs one at a time.
  4. Fold in the flour and baking powder.
  5. Add the milk and mix well.
  6. Spoon the mixture into the 3 cake tins and bake for about 20 to 22 minutes or until golden and when a skewer is inserted into the middle it comes out clean.
  7. Allow to cool completely.

To make the butter cream:

  1. Place the butter, Siúcra Icing Sugar and lime juice together and whisk until smooth, light and fluffy.
  2. Retain 5 generous table spoonful’s of buttercream to pipe around the edge and for sandwiching together.
  3. Add green colouring to the rest and whisk again until you’ve reached the colour you want.

To assemble:

  1. Place the heart shape template onto a cake and cut the shape.
  2. Slice the cake in half and repeat for the two remaining cakes.
  3. Spread some curd on one cake half and butter cream on the other and sandwich them together.
  4. Place the points of the hearts facing inwards in the shape of a shamrock (you may need to trim them a little, so they fit together.)
  5. Use a trimmed piece of cake as the shamrock stem.
  6. Spread butter cream over the top and sides of the cake.
  7. Colour a piece of Siúcra roll out – one green and a small piece, black. Using the green roll out, cut out small shamrocks and shape a leprechaun’s hat and trim with black rollout icing, place on the sides and top of the cake.
  8. Spoon the white buttercream into a piping bag with a nozzle and pipe around the cake.
  9. Secure a piece of ribbon around the board.


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