8 gherkins, drained, sliced
陆 lemon, juice only
陆 round lettuce, leaves separated
1 red onion, peeled, sliced
2 tomatoes, sliced
1 tbsp Dijon mustard
4 tbsp ready-made mild chilli relish
25g/1oz beer mustard or wholegrain mustard
salt and freshly ground black pepper
300ml/10陆fl oz rapeseed oil
2 tbsp vegetable oil
200g/7oz cheese, preferably Monterey Jack, sliced
3 egg yolks
800g/1lb 12oz best-quality beef steak, minced
4 brioche rolls, cut in half