Make the burger sauce: In a medium bowl, whisk together mayonnaise, ketchup, vinegar, chilli garlic sauce and mustard sauce. Assemble Zinger Burger: Toast the buns on a skillet or grill until golden brown. Then spread softened butter on the cut-side of the buns.
Place the bottom bun on a plate. Then spread some burger sauce. Place the crispy chicken on top, add lettuce, and drizzle more burger sauce. Add the top bun on top. Serve hot with French fries and salad.