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Preheat oven to 180C (350F).
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Place raisins and rum in a saucepan over low heat and simmer till almost all of the rum has been absorbed.
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Set aside and allow it to cool.
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Place butter, chocolate in a DRY saucepan over low heat and stir till completely smooth.
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Place chocolate mixture in a bowl and add sugar, eggs, flour, cocoa, baking powder, raisins and mix till combined.
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Pour mixture into 20cm (8 inch) square cake tin that has been completely lined with non-stick baking paper.
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Bake for 50-60 minutes or until set.
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Cool completely and cut into squares to serve.