Yield: 18 servings
Place the 2 tbsp sesame seeds in a blender container; cover and blend until ground. Transfer to a heavy gallon size self-sealing plastic bag; Add soy sauce, vermouth (or sake), molasses, sesame oil, and black pepper. Add beef cubes. Seal bag and turn to coat. Chill for 2 to 4 hours, turning bag occasionally.
Meanwhile, soak skewers in water for 30 minutes. Drain meat and pour marinade into a medium saucepan. Heat marinade and boil for 20 seconds. Remove from heat and keep warm.
Thread two meat cubes on each skewer. Place skewers on the rack of an unheated broiler pan; broil 3 to 4 inches from the heat for 12 to 14 minutes or until desired doneness, turning once and brushing with reserved marinade.
Arrange skewers on a serving plate. Sprinkle with toasted white and black sesame seeds.
Please note that some ingredients and brands may not be available in every store.