Toast the walnuts in a small non-stick pan over a medium flame, moving them about often to stop them burning. Let them cool and chop them roughly with a knife.
In the meantime, warm the ciabatta in the oven.
Wash the salad leaves and gently pat them dry with kitchen roll.
Cut the ciabatta in half horizontally and spread the bottom half with robiola, then continue adding salad, slices of salami, the walnuts and finally the honey.
Put the top back on the ciabatta, push down gently and enjoy your salami sandwich with the surprising taste!