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Preheat the oven to 170°C.
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Grease and line a 20cm cake tin.
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In the bowl of a stand mixer or with an electric beater, beat together the ricotta, vanilla, sugar and orange zest.
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Slowly whisk in melted butter
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Beat in eggs, one at a time.
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In a separate bowl, mix together the flour, almond meal, baking powder and salt to get rid of any lumps. Gently fold the dry ingredients into the egg mix until just combined.
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Pour into baking tin. Top with plums cut side up, scatter with flaked almonds and sprinkle caster sugar evenly over the top.
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Bake 45 min - 1 hour, until only just cooked through in the centre – a skewer inserted into the centre should still have crumbs. It will continue to cook as a it cools, and is better slightly under done than over.