Mix together in a small bowl the lime juice, Ponzu, sugar, garlic, curry paste, ginger and cilantro. Place the beef in a resealable bag and pour the marinade over the meat. Marinate for 2 and keep in refrigerator.
In a medium size bowl, mix together the vinegar, oil, sugar, and lime juice. Add the slaw, green onions and cilantro. Refrigerate until ready to use.
Heat a grill to medium and grill peppers for about 5 to 7 minutes on each side.
Grill the beef 1 to 2 minutes on each side or until browned. When the beef is done, slice the steak and peppers very thin.
In the meantime cook the tortillas according to package directions on a hot griddle for 30 seconds on each side.
Place some slaw on each tortilla. Top with peppers and beef. Garnish with avocado and basil. Season with sriracha sauce if desired.