1kg/2¼lb extra-lean minced (ground) beef
1 tbsp tomato ketchup
6 burger buns, halved
sunflower oil to brush
6 thin-cut slices havarti or raclette cheese
6 tbsp mayonnaise
6 lettuce leaves
3 large tomatoes, thickly sliced
6 cocktail gherkins, sliced
1 onion, thinly sliced
salt and ground black pepper
1 Put the minced beef and tomato ketchup in a large bowl and add some salt and plenty of pepper. Mix everything together.
2 Shape into six patties. Cover with clingfilm (plastic wrap) and chill in the refrigerator for at least 1 hour.
3 Heat a large griddle pan until it’s really hot. Put the burger buns, cut-side down, on the griddle and toast.
4 Lightly oil the griddle and cook the burgers over a medium heat for 3–4 minutes, then turn the burgers over. Put a slice of cheese on top and cook for 3 minutes.
5 Spread the mayonnaise on the burger buns. Add the lettuce, tomatoes, gherkins and onion rings. Add the cooked burgers and sandwich with the top of each bun.