Pork Loin: Combine lime peel, lime juice, oil, garlic, cilantro, pepper and salt. Place marinade in plastic bag; add pork, seal well, and turn to coat. Place pork and marinade in refrigerator at least 4 hours, turning occasionally. Remove meat from bag; reserve marinade.
In a covered grill, place roast over a drip pan. Cover and grill for 1- 1/2 hours, brushing with marinade often, until meat reaches a temperature of 155 degrees.
Remove from grill; cover loosely with foil, and allow to stand for 15 minutes. Slice and serve with Southwestern Pesto Sauce
Pesto Sauce: Place cheese, garlic, and jalapeno pepper in blender and process until finely grated. Add chili peppers, nuts, parsley and cilantro. With machine running, gradually add oil. Blend until nearly smooth. Serve with pork.
Pesto sauce makes 2 cups.
Please note that some ingredients and brands may not be available in every store.