Pound or slice a 16-ounce flank steak in half to a thickness of ¼” to ⅓”. Place the steak or steaks in a large glass dish along with the steak marinade. Marinate the beef in the refrigerator for 30-60 minutes.
Wash and trim ¾ pounds of green beans and one large bunch (6-8) scallions. Cut the scallions in half and place in a resealable bag along with the beans and the vegetable marinade. Marinate in the refrigerator for 30-60 minutes.
When ready to assemble the steak wraps, preheat the oven to 400 deg F. Slice the steak into 1½ - 2-inch-thick strips and stack 6-10 green beans and a few scallions into the middle of each steak strip. Roll the steak around the vegetables and secure the steak with a toothpick. Repeat.
Place the steak wraps onto a parchment lined baking sheet and bake for 15 minutes. Flip the steak wraps and bake for another 10 minutes or until the steak is caramelized and the veggies and nicely blistered.
Garnish the steak wraps with toasted sesame seeds if desired and serve with slaw, a nice salad or brown rice.