Wash the lettuce and tomato thoroughly and slice them.
Cut the burger bun in half and lightly toast it over low heat.
Season the two beef patties with salt and pepper, then grill them.
Place cheddar cheese on top of the patties and let it melt.
Slice the onion into rings and grill them in a pan.
Spread special Black Mamba sauce on the burger bun.
Layer lettuce, tomato, beef patties, cheese, and onion on the bun in that order.
Cover with the top bun and wrap for easy eating.