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Martha's white chocolate joy cake

Martha's white chocolate joy cake

An impressive and decadent cake, filled with white chocolate buttercream and a fresh passionfruit syrup.

4 out of 5 stars(1) Rate this recipe
  • Serves12
  • CourseCake
  • Prepare30 mins
  • Cook30 mins
  • Total time1 hr
  • Pluscooling

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For the sponge

  • 175g white chocolate, chopped
  • 2 British Blacktail Medium Free Range Eggs
  • 225ml milk
  • 375g plain flour
  • 250g caster sugar
  • 1 tbsp baking powder
  • 150g butter, diced and softened
  • 1 tsp vanilla extract

For the syrup

  • 150g passion fruit pulp (about 6 fruits)
  • 50g caster sugar

For the buttercream

  • 175g white chocolate, chopped
  • 225g unsalted butter, diced and softened
  • 225g icing sugar
  • 75ml double cream
  • Pomegranate seeds, to decorate
  • white chocolate balls, to decorate


  1. Preheat the oven to 170°C, gas mark 3. Grease and line 3x18cm round loose-bottomed tins with baking parchment.

  2. Melt the chocolate for the sponge in a heatproof bowl, set over a pan of simmering water, then set aside. Place all the remaining sponge ingredients into a large bowl and beat for 2-3 minutes, or until a smooth, thick batter forms. Fold in the melted chocolate, then spoon into the 3 prepared tins (see tip).

  3. Smooth the tops, then bake for 25-30 minutes, or until a skewer inserted into the centre of each cake comes out clean and they are golden brown. Cool for 5 minutes in the tins, then transfer to a wire rack and allow to cool completely.

  4. For the syrup, scoop the passion fruit pulp (reserving 2 of the empty skins for decoration) into a saucepan and add the caster sugar. Heat gently until the seeds are shiny and the liquid is bubbling, then remove from the heat and allow to cool completely.

  5. For the buttercream icing, melt the white chocolate in a heatproof bowl over a pan of simmering water, then set aside. Use an electric whisk to beat the butter, then gradually add the icing sugar until combined. Add the double cream and beat for 5 minutes until light and fluffy, then beat in the cooled chocolate until smooth.

  6. Stack the sponges, layering with buttercream and passion fruit syrup, then spread the top with the remaining buttercream. Drizzle with syrup and cover with pomegranate seeds, passion fruit skins filled with syrup and white chocolate balls. This cake will keep for 2-3 days in the fridge, but is best eaten immediately.

Cook’s tip

Use an ice-cream scoop to divide the mixture between the tins. This way, you know that the volume is the same for each one so you will create really even layers and they will all cook at the same rate. 


Typical values per serving when made using specific products in recipe


3,091kJ/ 739kcals



Saturated Fat












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Overall rating (4/5)

4 out of 5 stars1 rating