Place the mince, salt, pepper and onion flakes into a bowl and use your hands or a large spoon to mix well until combined.
Divide into six portions and shape the patties with your hands. Place on a plate and set aside until needed.
Add a tablespoon of olive oil to your frying pan and place over a medium heat.
Place 3 patties (this number will vary depending on the size of your pan) into the frying pan and cook for 3 - 4 minutes. You want a crust to start forming on the cooked side of your burger pattie.
Carefully flip the patties and cook for a further minute.
Tear the cheese slice in half and add it to the top of the pattie. Cook for a further minute or until the cheese is melted.
Transfer the cooked burger patties to a plate and let them rest for 5 minutes.
In the meantime, prepare the rest of your ingredients.
Place the cooked burger on the bottom piece of a brioche bun which has been cut in half. Add ⅙th of the onion, 4 slices of pickles and approximately ½ tablespoon mustard and 1 tablespoon of tomato sauce.
Top the with the bun and serve.