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1
To make the marinade -- In a blender or food processor, blend the ginger and garlic to a fine paste (you may need to add a little water to make a paste). Add the turmeric, chili powder, salt, cumin, yogurt, lime juice, and food coloring; process until combined.
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2
To prepare the chicken -- Remove the skin from the chicken, leaving some fat. Make a few slits in each piece and transfer to a nonreactive dish large enough for the pieces to lie flat. Pour the marinade over the chicken and stir to coat the chicken thoroughly. Seal with plastic, refrigerate, and marinate for at least 4 to no more than 12 hours, turning the chicken once. To grill the chicken-Ready a charcoal grill with an even layer of coals. While the grill is heating up, take the chicken out of the refrigerator. When the charcoal is red-hot, lay the chicken pieces on the grill about 2 inches apart. Baste with any remaining marinade. Cover the grill, leaving the vents half-open.
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3
Pour the marinade over the chicken and stir to coat the chicken thoroughly.
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4
After about 5 minutes, remove the grill lid and turn over the chicken pieces; they should look slightly charred. Replace the lid and continue cooking for another 5 to 7 minutes. Uncover the chicken, baste it with the melted butter, turn it over, and leave it uncovered for the rest of the cooking time. Baste after 2 or 3 minutes and test for doneness: the meat should feel firm when you press it.
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5
Transfer the chicken to a large platter. Arrange the onion, cilantro, chiles, and lime wedges over the chicken and seal the platter with foil. Let the chicken rest for 10 minutes to absorb the garnish flavors.
