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1
Center a rack in the oven and preheat the oven to 300u00b0F. Line an 8-inch square baking pan with foil, butter the foil, place the pan on a baking sheet, and set aside.
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2
Put the raisins in a small saucepan with the water, bring to a boil over medium heat and cook until the water almost evaporates. Add the rum, let it warm for about 30 seconds, turn off the heat, stand back and ignite the rum. Allow the flames to die down, and set the raisins aside until needed.
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3
Put the chocolate in a heatproof bowl and set the bowl over a saucepan of simmering water. Slowly and gently melt the chocolate, stirring occasionally. Remove the bowl from the saucepan and add the butter, stirring so that it melts. It's important that the chocolate and butter not get very hot. However, if the butter is not melting, you can put the bowl back over the still-hot water for a minute. If you've got a couple of little bits of unmelted butter, leave themit's better to have a few bits than to overheat the whole. Set the chocolate aside for the moment.
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4
Working with a stand mixer with the whisk attachment, or with a hand mixer in a large bowl, beat the eggs and sugar until they are thick and pale, about 2 minutes. Lower the mixer speed and pour in the chocolate-butter, mixing only until it is incorporatedyou'll have a thick, creamy batter. Add the dry ingredients and mix at low speed for about 30 secondsthe dry ingredients won't be completely incorporated and that's fine. Finish folding in the dry ingredients by hand with a rubber spatula, then fold in the raisins along with any liquid remaining in the pan.
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5
Scrape the batter into the pan and bake 50 to 60 minutes, or until the top is dry and crackled and a knife inserted into the center of the cake comes out clean. Transfer the pan to a rack and allow the brownies to cool to warm or room temperature.
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6
Carefully lift the brownies out of the pan, using the foil edges as handles, and transfer to a cutting board. With a long-bladed knife, cut the brownies into 16 squares, each roughly 2 inches on a side, taking care not to cut through the foil.
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7
The brownies are good just warm or at room temperature; they're even fine cold. I like these with a little something on top or alongsidegood go-alongs are whipped creme fraiche or whipped cream, ice cream or chocolate sauce or even all three!
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8
Wrapped well, these can be kept at room temperature for up to 3 days or frozen for up to 2 months.
