2 Little Gem lettuces, leaves trimmedseparated
750g/1lb 10陆oz trimmed leeks, finely sliced
5 sprigs fresh thyme, leaves only
50g/2oz watercress
1 tbsp wholegrain mustard
salt and freshly ground black pepper
3 tbsp extra virgin olive oil
1 tbsp white wine vinegar
50g/2oz butter
200ml/7fl oz double cream
1 free-range egg
1 free-range egg yolk
75g/3oz 驳谤耻测猫谤别 cheese, grated
225g/8oz ready-made shortcrust pastry
200g/7oz smoked salmon