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2 sticks unsalted butter
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2 cups dark rum
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In a medium stainless steel saucepan, cook the butter over moderate heat until it turns medium brown and smells nutty, about 5 minutes. Remove from the heat. Very gradually pour in the rum; it will froth up. Let cool to room temperature, then transfer to a bowl, cover with plastic wrap and refrigerate for two days.
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Skim off the solidified butter on the top. Strain the rum through a coffee filter.
Make Ahead
The rum can be refrigerated for up to a week.