At a glance
You're in for a stunning treat with this moss cake — a vibrant, green sponge that gets its color and earthy flavor from blended spinach and crushed pistachios. The process involves whipping egg whites and building a delicate batter that bakes for an hour, then chilling for several hours once assembled with banana cream and fruit, so plan ahead if you're making this for a special occasion.
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Stiff egg whites
Whisk the egg whites with the caster sugar until stiff peaks form.
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Sponge base
Beat the sugar with the butter, then add the egg yolks one at a time. Mix the flour with the baking powder and a pinch of salt, and stir this into the yolk mixture. Add the finely ground pistachios too.
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Blend the spinach
Blend the spinach together with the lemon juice into a smooth mixture, then fold it into the batter. Finally, gently fold in the stiff egg whites.
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