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Preheat the oven to 180 degrees C/350F and grease and line two 8/9" cake tins.
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Place the flour, baking powder and bicarb into a medium sized bowl and set aside.
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Place the butter and sugar into a large bowl or the bowl of your stand mixer and beat until light and fluffy, about 2 minutes on med-high speed.
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Add in the eggs and vanilla extract.
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Mix on medium speed until well combined and smooth. Add in the buttermilk and mix until well incorporated. The batter may look a bit split at this stage, but this is fine.
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Add in the flour mix and mix on med-high speed until well incorporated, about 1 minute.
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Divide the batter between the 2 cake tins and place in the oven for 25-30 minutes and then turn the oven down to 160C for the final 10-15 minutes. Cakes are done when risen, golden on top and an inserted skewer in the centre comes out clean.
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Leave the cakes to cool in the cake tins for an hour before transferring to a wire rack to cool completely.
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Once cooled, make the filling. Place the double cream, sugar and vanilla extract into a medium sized bowl and beat until thick, you want soft peak. The cream will look smooth and will hold its shape on a spoon for around 5 seconds before falling back into the bowl.
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Place one of the cakes on a plate and then spread half of the whipped cream on top of it. Sprinkle 1 cup of diced strawberries on top and spread them out.
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Place a small amount of cream right in the centre on top of the strawberries and then place the second layer on top, bottom side up.
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Spread the remaining cream on the top of the cake and sprinkle 1 cup of strawberries on top. Spread them out and then, if you'd like, place 3 whole strawberries in the centre to garnish.
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Cake will keep well wrapped in the fridge for 2 days.