Boil 4 clementines or oranges in water for 2 hours, then let them cool down.
Preheat oven to 170°C (gas mark 5-6) and butter a 10-inch springform tin.
Line the bottom of the tin with a folded piece of baking paper.
In a food processor, blend the boiled clementines (whole, apart from the juice).
Add baking powder, castor sugar, ground almonds, and eggs to the food processor. Mix well.
Pour the batter into the prepared tin.
Bake at 170°C for 1 hour.
Let the cake cool in the tin before transferring it to a rack to cool completely.
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