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1
Heat oil in a large nonstick skillet over medium-high heat. Add onion and plantain; cook 3 minutes or until lightly browned. Add chorizo, poblano, cumin, 1/4 teaspoon salt, and 1/8 teaspoon pepper; cook 4 minutes or until plantain is very soft. Place plantain mixture in a bowl; mash with a fork. Cool 10 minutes.
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2
Slice each breast half lengthwise, cutting to, but not through, other side. Open halves, laying breast flat. Place each breast half between 2 sheets of heavy-duty plastic wrap; pound to 1/4-inch thickness using a meat mallet or small heavy skillet. Sprinkle chicken with remaining 1/4 teaspoon salt and remaining 1/8 teaspoon pepper.
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3
Divide plantain mixture into 4 equal portions; spoon each portion down center of each breast half, leaving a 1/2-inch border at each end. Fold sides over filling.
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4
Place a 2-foot-long sheet of heavy-duty plastic wrap on a work surface with 1 long side hanging over the counter's edge by 2 inches. Place a stuffed breast half, seam side down, on the end farthest from you, and tightly roll the breast toward you, jelly-roll fashion. Twist the ends in opposite directions to form a cylinder. Tie plastic wrap in tight knots against the breast half on each end. Trim off excess wrap close to the knot. Place a second 2-foot-long sheet of heavy-duty plastic wrap on the work surface; place rolled chicken on wrap, and repeat procedure. Repeat with the remaining chicken breast halves.
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5
Bring 3 quarts of water to a boil in a large stockpot; add chicken. Simmer 15 minutes (do not boil), turning occasionally. Remove from water, and let stand 10 minutes before unwrapping and cutting into 1/2-inch-thick slices. Serve with salsa; sprinkle with chopped cilantro. Garnish with cilantro sprigs, if desired.
