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Choc-orange cake with Jaffa buttercream

Get the party started with this classic chocolate-orange cake, with a rich buttercream and crushed Jaffas.

By Jaclyn Koludrovic
  • 40 mins preparation
  • 3 hrs 15 mins cooking (plus draining, cooling)
  • Serves 12 - 18
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Classic chocolate and orange form the base for a rich cake capped with an extra-chocolatey icing and crushed Jaffas. Don't stop at orange: a bergamot base with Earl Grey buttercream makes a fine variation. Begin this recipe a day ahead to boil the oranges.

Ingredients

  • 2 large oranges, plus finely grated zest of 1 orange
  • Finely grated zest of 1 lemon
  • 300 gm caster sugar
  • 300 gm (2½ cups) almond meal
  • 70 gm desiccated coconut
  • 2 tbsp cocoa powder, sifted
  • 2½ tsp baking powder
  • 8 large eggs, beaten
  • Diced candied orange peel (optional) and crushed Jaffas, to serve
Chocolate buttercream
  • 50 gm dark chocolate (70% cocoa solids)
  • 250 gm butter, softened.
  • 300 gm icing sugar mixture
  • 50 gm Dutch-process cocoa
  • 60 gm (¼ cup) sour cream, whisked to soft peaks

Method

  • 1
    Place oranges in a saucepan, cover with water, and bring to the boil. Boil, topping up water if necessary, until soft (2-2½ hours). Drain in a colander, then place colander over a bowl and refrigerate to drain completely (6 hours or overnight). Discard seeds, then purée oranges in a food processor. Combine orange and lemon zest with 300gm orange purée. (Freeze remainder for another use.)
  • 2
    Preheat oven to 140°C. Grease a 21cm-diameter springform cake tin and line base and sides with baking paper. Combine sugar, almond meal, coconut, cocoa powder, baking powder and a pinch of salt in a large bowl. Add eggs to orange purée, whisk to combine, then add purée to dry ingredients and stir to combine. Spoon into tin and bake until cake is firm to touch and a skewer withdraws clean (45-50 minutes). Cool in tin (30 minutes), then turn out and cool completely. Transfer to a serving plate.
  • 3
    For chocolate buttercream, melt chocolate in a bowl over a saucepan of simmering water (don't let bowl touch water). Beat butter in an electric mixer fitted with the whisk attachment until pale and creamy. Sift sugar and cocoa together into a bowl, then with the motor running, add to butter a little at a time, beating until fluffy. Beat in chocolate, then fold in sour cream. Transfer to a piping bag fitted with a 1.3cm plain nozzle and pipe peaks onto cake. Scatter with orange peel and Jaffas to serve. Cake will keep refrigerated in an airtight container for 5 days.

Notes

Candied orange peel is available from The Essential Ingredient and select delicatessens.