Forget what you knew about subs! This Japanese-inspired sandwich is reminiscent of a lunch time bento box from your favourite sushi restaurant thanks to sweet teriyaki sauce, spicy wasabi and layers of avocado and sweet potato.
Bring a large pot of water to a boil. Add sweet potato slices and cook until just tender, about 8 minutes. Drain and set aside.
Marinate veal strips in 1/4 cup (60 mL) teriyaki sauce and season with salt and pepper for 15 minutes. Heat oil in a skillet over high heat. Pat meat dry and sear in batches for 3 minutes, or until just cooked through. Transfer cooked meat to a clean bowl and toss with remaining teriyaki sauce and sesame seeds.
Meanwhile, whisk together mayonnaise and wasabi; set aside. To assemble, top the bottom buns with wasabi mayonnaise. Top with veal slices, sliced avocado, and sweet potato. Top with chopped scallions and remaining bun half.