Preparation

Prepare a barbecue grill or preheat a gas grill. Place chicken thighs in a zip-top plastic bag. Add the soy sauce, vinegar, garlic, mustard, ginger, and black pepper. Seal the bag and gently shake to combine ingredients. Marinate at least 15 minutes, turn the bag over, and marinate at least 15 minutes longer. Meanwhile, add sesame seeds to a small nonstick skillet. Heat over medium for 1 to 2 minutes, or until slightly golden, tossing continuously. Do not let them turn dark brown. Remove from heat and set aside. Remove chicken from marinade and reserve marinade. Pat chicken dry with a paper towel. Place on grill about 6 inches from the heat. Barbecue 5 minutes, turn, and cook 3 minutes longer. A meat thermometer should read 180 degrees.