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Melt the chopped butter and unsweetened chocolate in a metal bowl over a simmering pot of water. Stir until all are dissolved.
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Add the eggs one at a time, beating well after each addition.
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Sift the flour into the mixture. Well, you don't have to sift it but be prepared to spend a good 20 minutes just squashing away flour lumps! speaking from experience ...
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We have found that the least painful way of getting the batter into those pretty cases with the least splatter is to use a humble jug to pour them in.
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Fill the cupcake cases three quarters from the base. This way, you get a bit of space on top for the frosting. Now, wasn't that simple?