2 heads Romaine lettuce, roots removed, cut into thick slices
1 red onion, thickly sliced
4 sprigs fresh thyme, leaves only
400g/14oz mixed heritage tomatoes, thickly sliced
300g/10陆oz heritage tomatoes
1 tbsp Dijon mustard
plain flour, for dusting
salt and freshly ground black pepper
1 tbsp rapeseed oil
4 tbsp vegetable oil
1 tbsp white wine vinegar
1 free-range egg yolk, beaten
1 egg yolk
200g/7oz 骋谤耻测猫谤别, grated (or similar vegetarian cheese)
400g/14oz ready-made all-butter puff pastry