Combine the milk and lemon juice and set aside. The milk might curdle – this is normal. Whisk together the flour, bicarbonate of soda and salt. In a separate bowl, beat the oil, sugar and vanilla together until well combined.
Add spoonfuls of the flour mixture to the oil and sugar mixture, alternating with the lemony milk, until just combined. Distribute the batter equally between the paper cases.
For the icing, beat together the ingredients until creamy. Chill until required. Spoon a dollop of the icing on top of each cake and spread out with the back of a spoon or a small blunt knife. Scatter with sprinkles if you are feeling fancy.
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