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Sift together the flour, potato starch, and baking powder. Set aside.
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Using an electric mixer, beat the eggs, sugar, salt, vanilla extract, and lemon zest for about 5 minutes, until pale and fluffy.
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Gradually add the vegetable oil, a little at a time, while continuing to beat the mixture.
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Add 2 tablespoons of the flour mixture and continue beating.
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Add the yoghurt, 1 tablespoon at a time, beating well after each addition.
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Add the remaining flour mixture and beat until smooth.
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Pour the batter into a greased 23 × 12.5 cm – 9 × 5 inch loaf tin. Bake in a preheated oven at 170°C – 340°F for about 45 minutes, or until a toothpick inserted into the centre comes out clean. Let the cake cool slightly in the tin, then transfer it to a wire rack to cool completely.
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Once completely cold, store the plumcake in a Ziplock bag, leaving it slightly open so the moisture does not spoil the cake. This helps keep the crust soft.
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Serve the next day for breakfast.