Method:
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Preheat the oven to 170°C and line a 20 cm baking tray with baking paper.
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In a large mixing bowl, rub the zest of the three lemons (only the yellow part!!) and sugar together with your fingers until fragrant.
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Add the eggs and whisk until the mixture is smooth and frothy.
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Add the lemon juice, olive oil, ricotta, and vanilla essence to the bowl and whisk until fully combined.
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Add the flour one spoonful at a time, then add the baking powder. Gently fold the mixture with a spatula until just combined. Carefully fold in the blueberries, reserving some of them.
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Transfer the batter to the prepared tin and smooth the surface. Scatter the remaining blueberries on top, pressing them lightly into the batter so they remain slightly exposed.
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Bake for 50 minutes, or until golden and a skewer inserted into the center comes out clean. Cool in the tin for 15 minutes, then transfer to a wire rack.



