1 large onion, thinly sliced
250g/9oz plain flour, sifted, plus extra for dusting
salt and freshly ground black pepper
whole nutmeg, for grating
陆 tsp salt
2 tbsp sunflower oil
250g/9oz full-fat cr猫me fra卯che
250g/9oz Emmental or Gruy猫re, or a mixture, grated
160g/5陆oz smoked bacon lardons