In a small bowl, combine mustard, sesame oil, 1 tsp. Sriracha, and lemon juice.
In a large bowl, combine the cabbage and sesame seeds.
Pour the dressing over the cabbage mixture and toss. Set aside.
In another large mixing bowl, mix the A1 sauce, honey, vinegar, Worcestershire sauce, 2 tsp. Sriracha, soy sauce salt and pepper. Give that a mix.
Add the onions and ground beef. Mix until well combined.
Shape into patties and grill for 5-7 minutes per side.
The patties will not hold together, but that is intentional. Allow them to crumble apart on their own or chop them into chunks with a metal spatula.
Scoop the crumbled patty into a warmed pita,
Add some cucumber, red pepper and cheese. Top with the cabbage mixture.