Cook the Flame Grilled Chicken Steaks as per packet instructions.
Lightly butter the sesame seed burger buns and toast until golden brown.
Spread the bottom of each burger bun with tomato sauce, then top with the chicken steak, a slice of cheese, handful of gherkins, 2 slices of white onion, 2 slices of tomato and a lettuce leaf. Spread the mayonnaise on the top of each burger bun and place on top. Serve immediately.