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1
To toast spices (coriander, cumin), place spices in a dry skillet. Heat and stir over medium heat until fragrant. Immediately remove spices from skillet. Combine ancho chile powder, paprika, coriander seed, cumin and salt in small bowl; set aside.
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2
Cut 2 large pieces of plastic wrap. Place plastic wrap pieces on work surface in a cross position. Place roast on top in the center. Rub 2 teaspoons of oil on top of roast; spoon and pat half of the spice mixture on top. Carefully turn over roast on plastic wrap. Rub 2 teaspoons of oil on top; spoon and pat on the remaining spice mixture. Tightly wrap pork in the plastic wrap. Refrigerate for 8 to 12 hours.
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3
Preheat oven to 300u00b0 F. Add the remaining 2 tablespoons of oil to a 6-quart heavy Dutch oven. Heat over medium-high heat.
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4
Unwrap roast and place in hot oil in Dutch oven. Cook on each side for 1 to 2 minutes or until spices begin to brown and appear slightly dry. Transfer roast to a plate. Remove Dutch oven from the heat. Slowly and carefully pour in beer, scraping brown bits from bottom of pan. Add water, vinegar, chipotle peppers, onion and garlic. Return to heat; bring to a gentle boil.
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5
Add the pork roast to the hot liquid. Cover and bake in preheated oven for 2 1/2 to 3 hours or until pork is fork tender.
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6
Transfer pork to a cutting board; cool slightly. Meanwhile, pour liquid through a fine mesh strainer; reserve 1 1/2 cups.
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7
Discard remaining liquid and solids. Shred meat using 2 forks; transfer to a medium container. Add the 1 1/2 cups reserved liquid. Cover and refrigerate until ready to use or for up to 2 days.
