Soak 8 bamboo skewers in water for 30 minutes while you prepare recipe.
To make chimichurri: In small bowl, mix together chopped cilantro, olive oil, garlic, salt and pepper. Set aside.
To make Mahogany chicken: In medium bowl, mix together brown sugar, mustard, hoisin sauce and vinegar. Reserve two-thirds of this mixture. To use the remainder, add 1/2 cup lime juice and stir in chicken. Cover and refrigerate.
To make sweet potatoes: Place sweet potatoes in heavy saucepan and cover with boiling water. Cook, covered over medium high heat until tender, about 15 minutes.