Spoon's ultimate burger deluxe

Makes 2 - 6oz burgers

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The real Burger Kings

The Marquee's vegetarian burger

Lucky Seven Maryland Crab burger`

Leave out the foie gras and you have Spoon's classic burger – a treat in itself.

250g/9oz Aberdeen Angus sirloin, trimmed of fat

250g/9oz Aberdeen Angus chuck, about 10 per cent fat

70g/21/2oz (approximately) foie gras

1/2 onion

30g/1oz butter

2 sesame seed buns

Lettuce leaves

2 tomatoes

Chop beef with sharp knives or a cleaver until fine but not too smooth. Chop onion very fine and sauté in butter slowly until soft and brown. Drain and chop again. Mix fried onions into beef, adding a twist of pepper. Shape beef into rounds not less than 1.5cm (1/2in) thick. Wrap in clingfilm and chill for half an hour. Grill or fry fiercely for about two minutes on each side, seasoning with salt.

Cut a slices of foie gras to fit each burger. Fry for around 30 seconds on each side. Serve in a bun immediately, stacking foie gras on top of beef, and adding the salad.