1 beef tomato, sliced
25g/1oz chopped coriander
陆 iceberg lettuce, shredded
1 onion, chopped
1 red onion, sliced
1 tbsp Dijon mustard
4 tbsp mayonnaise
salt and freshly ground black pepper
1 tbsp olive oil
4 slices mature Cheddar
1 free-range egg yolk
540g/1lb 3oz minced beef chuck steak
4 ciabatta rolls