Flo Braker's Tropical Night Brownies

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10 tablespoons (1 1/4 sticks) unsalted butter

2 ounces El Rey Gran Saman dark chocolate (70 percent cacao) or Scharffen Berger dark chocolate (70 percent cacao), finely chopped

3 ounces El Rey Bucare dark chocolate (58.5 percent cacao), finely chopped

1 cup packed light brown sugar

1/2 cup granulated sugar

3 eggs, lightly beaten

1 tablespoon dark rum

1 teaspoon pure vanilla extract

1/2 cup plus 1 tablespoon unsifted all-purpose flour

1/4 teaspoon salt

1/4 cup unsweetened medium flaked coconut or 1 cup fresh coconut, grated on the medium side of a box grater

1/2 cup (1 1/2 ounces) unsalted roasted cashews, coarsely chopped

1/4 cup finely chopped cacao nibs