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1
Preheat oven to 350u00b0F and line a baking sheet with a silicone mat.
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2
Pour cherries into a blender and puree. Pour puree into a fine mesh sieve set over a bowl. Set aside to allow the liquid to drain out.
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3
To make the whoopie pies, sift together the flour, baking soda, baking powder, and salt. Set aside.
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4
In a large bowl cream together the butter and sugar. Add in the egg and vanilla extract and combine. Alternate adding the dry ingredients about 1 cup at a time and the milk, combining completely after each addition. Fold in the lime zest and the cherry puree.
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5
Affix a pastry bag with a round, open tip and fill with batter. Pipe the batter onto the silicone baking mats, making circles about the size of a quarter. Be sure to space the circles about 3 inches apart. Place baking sheets in the oven and bake for 8 minutes. Remove from oven and allow to cool on pans for about 5 minutes before transferring them to wire racks.
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6
To make the filling, cream together the butter and the shortening. Add in the confectioner's sugar about 1 cup at a time and combine completely after each addition. Beat in the vanilla extract, merengue powder, salt, lime juice, and tequila. Beat for about 10 minutes.
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7
Match the whoopie pie chips up by size and fill with frosting by either spreading it on one side with a spatula or using a pastry bag.