Another week, another rhubarb recipe - because the season is short and you’ve got to seize that day. Regardless of whether you’re a die hard rhubarb and custard boiled sweet fan or not, this cake offers a slice of pure taste nostalgia with its creamy egg yellow buttercream, infusions of Bird’s custard powder and sharp rhubarb cutting through the golden sponge’s sugary haze.
Incidentally, if you can’t track down those rosy rhubarb stalks, a spread of good quality raspberry jam between the cake layers will do a similar trick - the resulting cake will have all the visual leanings of a classic Victoria Sponge but with an even more assertively retro taste.
For a 6″ cake to serve 8, you will need:
225g caster or granulated sugar
For the rhubarb compote - makes extra to serve alongside the cake (or as an awesome breakfast side dish), if liked:
500g rhubarb, washed trimmed and chopped into 1″ slices
For the custard buttercream:
Pre-heat your oven to 165 degrees
Grease and line 3 x 6″ tins (alternatively you can prepare as many tins as you have and bake in batches)
In a free standing mixer, or a large bowl with wooden spoon and plenty of elbow grease, cream together your butter and sugar until well mixed
Add your eggs one at a time, beating well in between each addition
Pour over your vanilla and fold in the custard powder and self raising flour, mix until well combined
Divide the cake batter between your prepared cake tins and bake for 20 minutes
Whilst your cakes are cooking, prepare the rhubarb compote by heating your rhubarb and sugar gently in a large saucepan with splash of water for around 10-15 minutes or until the rhubarb is softened but retaining its form. Set aside and leave to cool
Returning your attentions to the cakes - when cooked they will be springy to the touch and a skewer inserted will come out clean with no batter adhering
Remove your cakes from the oven, leave to cool for a few minutes before running a table knife around the inside of the tin and turning out the cakes onto a cooling rack to cool completely
Whilst your cakes are cooling, make your icing by creaming together the icing sugar, custard powder and melted butter in a free standing mixer or in a large bowl
Once the mix starts to come together, pour in the sour cream, sprinkle over the salt and beat vigorously for a few minutes until lump-free, light and creamy. Set your icing aside, as the butter cools you’ll be left with a thicker icing
Carefully level your cakes to make sure they are an even thickness - slicing away the top layer will also help the rhubarb permeate flavour-wise and leave a lovely pink stain
Smear a little of your icing onto a cake stand and add your first cake layer with the cut side facing up
Spread over a couple of spoons of the rhubarb compote onto the cake’s cut side and top with a thick layer of the custard buttercream
Liberally brush both sides of your next cake layer with the rhubarb compote, place on top of the first cake layer before topping with more buttercream
Take your final cake, spread another two tablespoons of rhubarb compote onto the cut side and place this down onto the buttercreamed second cake layer
Apply a crumb coat of buttercream to the entire cake and leave in the fridge to set for at least 20 minutes, or until the icing is firm to the touch
Remove the cake from the fridge and coat with the rest of the icing, smoothing over with a palette knife
Return your cake to the fridge for at least an hour to ensure neat even slices, or if you can’t resist get stuck straight in
Serve with a few spoonfuls of rhubarb compote if liked