1 ½ pounds beef sirloin tips, cut into 1 ½-inch cubes 1 bottle Kikkoman® Teriyaki Marinade & Sauce, plus extra for brushing 1 large sweet onion, cubed 1 red bell pepper, cubed 1 yellow bell pepper, cubed 1 orange bell pepper, cubed
Scallion Sauce: 15 scallions, very thinly sliced ¼ cup fish sauce 3 tablespoons vegetable oil 2 tablespoons Kikkoman® Soy Sauce 2 tablespoons toasted sesame seeds
Place beef cubes in a large sealed plastic bag. Add teriyaki marinade and seal the bag, pressing out as much air as possible. Transfer to the refrigerator and marinate for 6-8 hours.
Thread beef onto metal skewers, alternating with the onion and colorful bell peppers. Discard the marinade.
Combine all ingredients for the scallion sauce in a large bowl just before you begin grilling; stir occasionally and add extra soy sauce depending on your taste preference.
Light a gas or charcoal grill. Grill the skewers over direct high heat until beef is well seared on all sides, about 3-4 minutes per side. Brush the skewers all over with additional Teriyaki Marinade & Sauce.
Cover grill and continue to cook until center of beef is medium. Transfer skewers to platter and let it rest for 5 minutes. Serve immediately with the scallion sauce on the side for extra dipping.