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Combine pineapple juice, water, and honey in a large bowl, whisking until completely combined; set aside.
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Combine masa, baking powder, and salt in the bowl of an electric mixer fitted with the paddle attachment. Blend until combined. Add shortening; blend until shortening is evenly distributed through masa.
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Add the salt and the baking powder. Using a whisk combine all ingredients.
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Add pineapple juice mixture, a cup at a time, until mixture resembles the consistency of mashed potatoes. (You may not use all of pineapple juice mixture.)
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Gently fold in raisins and pineapple. Set aside for 1 hour.
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Remove cornhusks from the water and drain. Spray insides of cornhusks with nonstick spray.
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Scoop out 1/3 cup of tamale dough and place inside a cornhusk. Using your hands, shape dough into a rectangle in the lower, wider part of the husk. Fold right side, then left side over tamale dough. Fold up bottom edge. Repeat with remaining tamale dough and cornhusks.
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Add a few inches water to a large stockpot, and place a steamer basket inside. Place tamales in steamer, stacking no more than 2 high. Place pot over high heat to bring water to a boil, then lower heat to medium-low.
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Steam tamales about 1 hour, or until the tamales start to separate from the cornhusks. Check water level periodically, and add more water if needed.
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Remove pan from the heat and allow the tamales to rest 15 to 20 minutes while still covered. Serve warm.