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Preheat oven to 175°C. Line a standard 12-hole muffin pan with cupcake liners and set aside.
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In a jug, mix together the lemon juice and milk and leave to stand for at least 10 minutes whilst we carry on with the recipe. This will be your buttermilk!
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Then, in a large mixing bowl, cream together the butter and sugar until it is pale.
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Add the egg and mix until fully combined.
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Next, mix in the oil, red food coloring, and vanilla extract.
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Add the buttermilk, which should now be curdled and lumpy (don’t worry, it will taste great) and mix well.
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Now fold in the flour, cocoa, bicarbonate of soda, and salt until all of the dry mix is fully incorporated into the wet.
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Fill your cupcake liners to about half to two-thirds full. You should end up with about 16-18 cupcakes.
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Bake for around 15-20 minutes or until the tops of the cupcakes spring back when lightly touched and a toothpick inserted into the center comes out clean.
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Leave the cupcakes to cool completely on a wire rack.