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Preheat the oven to 375 degrees and line a 10"x4" baking loaf pan with parchment paper, making sure it exceeds the sides.
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Zest the fruit into the bowl of the electric mixer.
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Add the sugar and eggs into the bowl and cream together with the stand mixer on low or medium.
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Juice the citrus fruit into a 1 cup measuring glass (anywhere from 1/8 cup to 1/3 cup of juice is fine).
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Add buttermilk to the measuring cup to bring the liquid level up to 1/2 cup.
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Mix liquid into the electric mixer.
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Once combined, add the softened butter to the mixer. Mix until the butter is in small flecks and pieces (it will never fully incorporate).
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Add in the flour and baking powder together and mix on low until combined.
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Pour the batter into the parchment lined loaf pan, spreading evenly.
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Bake for 60 minutes or until a toothpick comes out of the centre evenly.
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Use the overhanging parchment paper as a handle to lift the loaf from the pan to a cooling rack.
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Peel back the paper from the sides and allow to cool completely on the rack.
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Serve slices warm or room temperature.
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Store any cooled cake, covered at room temperature.