Lettuce, onion, avocado, pickles, mayonnaise, ketchup, etc.
As you like
Give them three eyes to make them extra-monstrous.
Cut sliced cheese into the shape of fangs, as above. Cut the remaining cheese into circles. Stick on the nori seaweed for pupils.
Toast the buns briefly in a toaster. Top with the lettuce, mayonnaise, avocado, onion, hamburger patty, and ketchup, in that order.
Top with cheese and sandwich the buns. Stick on the eyes to finish. Serve with French fries and onion rings, if you like.
Story Behind this Recipe
I was trying to make vampire burgers and ended up with monsters instead.
You could also use teriyaki chicken or egg salad or ham instead of beef patties. It might also look cute with bread rolls, croissants, or hot dogs. For the eyes, I used a metal cap that usually comes with cream, usually 2 cm in diameter.