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Preheat the oven to 180°C, and grease and line a 23 x 12cm loaf tin with baking paper.
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In a saucepan, gently heat the butter, sugar, citrus zest and juice until the butter is melted and sugar has dissolved. It should not boil. Remove from the heat to cool.
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Whisk in the vanilla and eggs. Sift in the flour, baking powder and salt, and add the ground almonds. Whisk gently until smooth (try not to overmix).
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Pour about half of the mixture into the tin and dot with half the berries, gently pushing them into the batter. Pour over the remaining batter, spreading it to the edges over the berries, then place the remaining berries on top (don’t push them in this time as the loaf will rise up around them). Sprinkle the berries on the surface with the extra tablespoon of caster sugar.
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Bake for 50-60minutes or until a skewer inserted just comes out clean and the loaf begins to pull away from the sides. Cool in the tin.
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To serve, dust with icing sugar and serve with whipped cream or greek yogurt.