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1
Wrap the sweet potato with a damp paper towel and microwave on high until very soft, 3 to 4 minutes. Transfer to a bowl, mash with a potato masher, and set aside to cool. Meanwhile, in a medium skillet over medium heat, cook the bacon until golden and crisp, about 8 minutes. Use a slotted spoon to transfer bacon to a paper towel-lined plate, then set aside to cool. Carefully set aside 2 tablespoons of bacon drippings from the skillet.
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2
Preheat oven to 375 degrees F. Line a large baking sheet with parchment paper.
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3
In a food processor, combine the flour, baking powder, sugar, baking soda, salt, and allspice and pulse a few times. Add the cubed butter and pulse to make a coarse meal with a few pea-sized pieces. Transfer mixture to a large bowl and gently mix in the bacon, buttermilk, and 1 cup of the mashed sweet potato (save any remaining potato for another use).
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4
Transfer mixture to a floured work surface and knead a few times to form a dough. Pat the dough to about 1-inch thick, then gently fold in half. Gently repeat 4 more times. Roll the dough out to 3/4-inch thick, then use a floured 2 1/2-inch biscuit cutter to cut dough into biscuits, arranging them on the prepared baking sheet. Gather the scraps and repeat to make a total of 12 biscuits. Bake until the biscuits are browned and a tester comes out clean, 15 to 18 minutes.
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5
Meanwhile, combine the softened butter, honey, and reserved bacon drippings, mixing until smooth. Add salt to taste.
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6
Serve the biscuits with the honey butter on the side.
