You will need
Mix all the ingredients together lightly with a small knife. Leave to rest for 10 minutes. Shape into 8 patties. Oil the patties lightly on both sides and cook them on a very hot cast iron griddle pan until clearly marked on both sides and cooked through.
Slice the buns in half and toast the cut sides.
Place a patty on the bottom half of each bun.
Spoon a generous dollop of Sauce over each patty.
Top with a slice of tomato, seasoned with Green Onion seasoning then the onion rings. Place some rocket leaves on top and finish the hamburger off with the sesame half of the bun.