- Why did the edges of the coloured layer brown?
- Too high a temperature. Coloured doughs need to be baked at a lower temperature to prevent the sugar from caramelising (browning), keeping the colours vivid.
Rainbow cake
The rainbow cake is a celebration of patience and precision. A spectacular, six-layer wonder where each layer is baked separately, preserving its vibrant colour. The secret is the neutral-tasting white sponge base, which acts like a painter's canvas: clearly reflecting the added colours. The cream hidden between the thin layers and the white outer coating complete the surprise when sliced.
Ingredients
350
g
Plain flour
300
g
Caster sugar
200
g
Butter (room temperature)
5
pcs
Eggs
200
ml
Milk
1
packet
Baking powder
1
tsp
Vanilla extract
200
g
Icing sugar (for the cream)
500
ml
Double cream
1
set
Gel food colouring set (rainbow colours)
300
g
White fondant (for covering)
1
pinch
Salt
Shopping List (0)
Equipment Needed
- 6 identical cake tins (or fewer, baking in batches)
- Scales
- Gel food colouring
- Turntable
Allergen Information
Cereals containing gluten
Eggs
Milk
Instructions
1
✓
Mix the base batter: Cream the butter and sugar, add the eggs, then alternate adding the flour mixture (flour+baking powder+salt) and milk.
Tip: It is important that the batter is stable and smooth to support the dye.
2
✓
Weigh the finished batter and divide into 6 precisely equal portions in bowls. Colour them one by one.
Tip: Add the gel colouring with a toothpick. The colour will deepen slightly during baking.
3
✓
Bake the layers at 180°C for about 12-15 minutes. Be careful not to let them brown! Leave to cool completely.
Tip: Thin layers bake quickly and dry out fast. Cover them with a tea towel while cooling.
4
✓
Whip the double cream with the icing sugar until very stiff.
Tip: The cream should be ice cold. You can use a cream stabiliser to be safe.
5
✓
Layer the cakes in rainbow order (purple at the bottom, red at the top), with a thin layer of cream in between. Coat the cake with the remaining cream.
Tip: This 'crumb coat' traps coloured crumbs so they don't show through the white fondant.
6
✓
Cover with the white fondant and decorate.
Tip: Under fondant, whipped cream can sometimes melt the sugar paste. It is better to use buttercream for sealing, or serve immediately.
Recipe FAQ
Ingredients
- 350 g Plain flour
- 300 g Caster sugar
- 200 g Butter (room temperature)
- 5 pcs Eggs
- 200 ml Milk
- 1 packet Baking powder
- 1 tsp Vanilla extract
- 200 g Icing sugar (for the cream)
- 500 ml Double cream
- 1 set Gel food colouring set (rainbow colours)
- 300 g White fondant (for covering)
- 1 pinch Salt