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1
In medium fry pan over medium-high heat, heat 1 tablespoon of the vegetable oil.
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2
Add chopped plantain and saute until golden and slightly softened, about 5 minutes.
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3
Transfer plantains to a bowl and set aside.
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4
Heat remaining 1 tablespoon oil in the saute pan and add onion.
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5
Saute until golden, about 4 minutes.
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6
Add beans, cilantro, cumin, and cayenne and saute until mixture is heated and flavors are blended, about 5 minutes.
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7
Add lime juice and season with salt.
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8
Remove from heat.
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9
Using a potato masher, mash bean mixture until it forms a coarse paste.
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10
Transfer to a bowl and set aside to cool.
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11
Add plantains to bean mixture and stir to combine.
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12
Line two baking sheets with parchment paper.
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13
In a small bowl, whisk together egg and milk to make egg wash.
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14
Spread one sheet of puff pastry on a lightly floured surface.
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15
Dust pastry lightly with flour and, using a rolling pin, roll into a 14-inch square.
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16
Using a sharp paring knife, trim dough edges.
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17
Cut dough into four equal squares.
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18
Using a pastry brush, brush edges of each square lightly with egg wash. Place 1/4 cup of cooled filling on each square and sprinkle with 2 tablespoons of queso fresco and 1 1/2 teaspoons of butter.
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19
Fold dough in half to form a triangle.
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20
Seal edges by pressing them together with the tines of a fork.
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21
Transfer to a baking sheet.
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22
Poke a few holes in the top of each empanada with the tip of a paring knife.
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23
Repeat with remaining sheet of puff pastry and remaining filling.
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24
Cover the baking sheets with plastic wrap and refrigerate for 15 to 30 minutes to firm slightly.
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25
Meanwhile, heat the oven to 400 degrees F.
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26
Remove empanadas from the refrigerator and remove plastic wrap.
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27
Brush top of each empanada with egg wash.
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28
Bake until golden brown and flaky, 20 minutes.
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29
Transfer to a wire cooling rack to cool slightly.
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30
Serve warm, with tomatillo salsa or sour cream on the side.