To begin, make the peanut sauce. Put all ingredients for the sauce in a blender and blend until smooth.
Marinate the pork in a 1/4 cup of sauce, cover and place in refrigerator for at least 30 minutes. Set aside remaining sauce. After pork has marinated and the skewers have been soaked in water for at least 30 minutes, thread the pork onto the skewers. Pre-heat barbecue or grill pan over medium heat. Brush grill or pan with oil and when ready, cook pork, turning occasionally until cooked through, about 8-10 minutes.
To serve, arrange skewers on a platter with lettuce cups, radishes, cucumber, scallions, cilantro, mint sprigs, chopped peanuts and serve with remaining peanut sauce. Remove pork from skewer, place in lettuce cup and top with remaining ingredients. Serves 4-6.