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Preheat oven to 180 degrees.
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Butter a Bundt cake pan and set aside.
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In a large bowl, cream the butter and sugar until well combined.
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Add the skyr and mix until you get a light and fluffy consistency.
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Incorporate the eggs one by one.
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Add the lemon juice and zest and mix until well combined.
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Add the flour, baking powder and baking soda and mix well.
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Pour into the mold and smooth as needed. Bake 35 to 40 minutes or until cake is set and a toothpick inserted comes out clean.
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Let cool for at least 15 minutes before unmolding on a rack.
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In a bowl, add the juice of mixed blackberries and incorporate the icing sugar spoon by spoon.
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Whisk together after each addition of icing sugar until you get a smooth and fairly thick consistency.
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Add sugar until you reach your desired consistency.
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Pour the purple frosting on top of the cake and serve.