PREPARE THE KEBABS
Preheat the grill on high. If you are using wooden skewers soak them in water for 20 minutes. Make marinade and pour 1/4 of the marinade over the Wagyu Tenderloin Pieces and allow to marinate overnight.
Remove the beef from the marinade. Thread and alternate the marinated beef pieces with onion and mushrooms on each skewer. Grill the kebabs, turning, until the ingredients are charred and cooked to desired doneness, 5 to 15 minutes. Use the additional marinade to brush on the kebabs while they are cooking for extra caramelization. Sprinkle with sesame seeds and sliced green onions for garnish.
Kalbi Marinade
Combine all ingredients and whisk until the sugar dissolves and everything is well blended.
Makes enough marinade for 4 lbs. of meat, extra marinade can be stored in the refrigerator for up to 3 days, can also be used for brushing.