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All of the ingredients except for the chicken breasts are going to be pureed in a blender. Make sure the mango and garlic are chopped in small pieces - the puree should come out very smooth.
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Once all the ingredients are blended, set it aside in a covered container and refrigerate it for 30 minutes.
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Pour half of the pureed mango grilled chicken marinade into a baggie or covered container with the chicken breasts.
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Refrigerate them at least 4 hours or overnight. Reserve the remaining half of the puree for basting.
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Light a charcoal barbecue or gas grill. Shake off excess marinade from the chicken breasts and discard it.
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Grill the chicken breasts, turning them once, until they are cooked through - there should be no pink in the center of the breasts. Start basting the breasts with the remaining puree about 5 minutes before they are done.
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Remove the grilled chicken breasts to a warmed platter and serve warm.