McDonalds Big Tasty Burger

Ingredients:

400g Ground Beef/Beef Mince
salt & pepper to season
2 sesame seed bread buns
6 slices swiss cheese
1/4 cup onion
1/2 iceberg lettuce
4 slices tomato
SAUCE
1/2 cup whole egg mayonnaise
1 tsp ketchup
1 tsp american mustard
1/2 tsp smoked sea salt