METHOD
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preparation
Grease an 8-inch (20cm) springform cake pan with butter and sprinkle with flour. Shake off any excess flour. Place a rack in the middle of the oven and preheat to 180 °C / 350 °F.
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cake batter
In a small bowl, stir to combine the flour and baking powder. Set aside until needed. Add butter, sugar, salt, vanilla paste, and grated lemon zest to a large bowl. Beat with an electric mixer until creamy, for about 5-8 minutes.
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cake batter
Gradually add the eggs. Before adding the second egg, make sure the first one is well incorporated. Sift in the flour mixture and mix until just combined. Stir in the sour cream using a spatula.
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Bake the crumble
Pour the batter into the prepared springform pan and spread evenly using a spatula. Clean the fruits, and cut them into even wedges or slices. Arrange on top of the cake batter and place in the preheated oven. Bake for 40 - 45 minutes at 180 °C / 350 °F or until the cake is soft inside and golden-brown outside. Set aside to cool to room temperature.
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serve
In a small bowl, stir to combine sour cream and honey. Cut the cake into eight slices and divide it between eight plates. Serve with a dollop of sour cream mixture. Optionally sprinkle with chopped pistachios.