Carrot cake from leftover bread

Carrot cake from leftover bread
  • Low potassium
  • Low protein
  • Vegetarian
  • Dessert
  • Special occasion
  • 3 hours or less
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This cake makes delicious use of leftover bread for an indulgent, low potassium treat.


Carrot cake

400g bread (white or wholemeal), torn

100g soft light brown sugar

1 egg

100g full fat yoghurt

50g vegetable oil

2 teaspoons ground cinnamon

1 teaspoon bicarbonate of soda

1 teaspoon vanilla extract

Zest of 1 orange

90g carrot, grated

90g raisins

Passionfruit curd

1 egg yolk

1 tablespoon caster sugar

100g passion fruit juice

15g unsalted butter

1 tablespoon cornflour

Mascarpone cream

100g double cream

100g mascarpone cheese, softened

25g icing sugar

1 teaspoon vanilla essence

To serve

Β½ teaspoon cinnamon

1 teaspoon thin slices of orange peel


  1. Step 1

    Pre-heat the oven to 175Β°C / 145Β°C fan / gas mark 4 and grease and flour a rectangular baking tray 11” x 8.5”. Add the torn bread to a food processor and blitz to fine crumbs. Add the sugar, egg, yoghurt, oil, ground cinnamon, bicarbonate of soda and vanilla extract and blend until smooth. Pour into a mixing bowl and stir in the orange zest, carrot and raisins until evenly mixed. Put the cake mix into the baking tray and bake for 25-30 minutes, until a skewer comes out clean.

  2. Step 2

    Passionfruit curd: Whisk the egg yolk and sugar together and set aside in a bowl. In a heavy-bottomed saucepan, gently heat the passion fruit juice and butter just until the butter has melted, then gradually stir in the cornflour making sure you mix continually so there are no lumps. Take the mixture off the heat and whisk a few tablespoons of it into the egg mixture in the bowl. Continue whisking, adding a few tablespoons of the mixture into the egg mixture at a time.

  3. Step 3

    Once the two mixtures are fully combined, pour it back into the saucepan and return to a low to medium heat, stirring continually so that the eggs don’t curdle or scramble. Cook for 5-8 minutes until the curd has thickened. Remove from the heat and strain through a fine mesh sieve into a bowl. Cover with clingfilm directly on the surface of the curd and refrigerate for at least 2 hours before using.

  4. Step 4

    When the cake is baked and the skewer comes out clean, remove from the oven and leave to cool for 10 minutes before transfering to a wire rack to continue cooling.

  5. Step 5

    Mascarpone cream: In a mixing bowl, beat the mascarpone cheese and double cream until smooth and creamy. Gradually add the icing sugar and vanilla extract and continue beating until well combined.

  6. Step 6

    Once the cake is cooled, cut into 20 squares. Pipe cream around edges of 10 squares of cake and fill the centres with a little curd. Place the remaining 10 squares on top and decorate with the remaining cream. Sprinkle with cinnamon and orange peel to finish. Let the cakes rest overnight in a cool place or even in the fridge, so the flavours develop.

Food facts

The bread is the main source of carbohydrate in this recipe, and the value has been provided for those who have been trained in insulin adjustment.

This recipe is low in potassium, when following the quantities and serving sizes given, so is a suitable treat for those advised to reduce the potassium in their diet.

This recipe is high in phosphate, therefore, enjoy as an occasional treat, and if you have been prescribed a phosphate binder, take as directed.

This recipe is low in protein, therefore suitable occasional treat, if you have been advised to eat less protein.

It may be difficult to source passion fruit juice. Instead, consider mango or pineapple (these are lower in potassium than apple or orange juice).

Use gluten-free bread

This recipe is high in fat and contains a moderate amount of salt from the bicarbonate, and should be only be enjoyed occasionally, as part of a healthy balanced diet.

Once cooked and cooled, this recipe can be stored in an airtight container in the fridge for up to 3 days.