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Place all cake ingredients in a mixing bowl. Beat with a wooden spoon until well mixed for 2–3 minutes. Place mixture in 12 paper cases placed in a muffin tray.
Bake in a preheated moderately hot oven 180ºC on the middle shelf for 15–20 minutes until soft and springy to the touch. Cool on a wire tray.
For the icing, place all ingredients together in a mixing bowl and beat together until smooth. Spread evenly over the cakes and decorate with the lemon zest.