10 minutes ago, liuzhou said:
I've seen favourable reports about using panko, too. Again, I've never tried it so can't really say much.
Panko would probably be okay if that's all you have but I think this needs a bit more body and panko tends to get mushy. What I used was good homemade bread**, blitzed in the food processor, and then toasted in the oven to dry until it is just a pale brown and thoroughly dry. Then, as you would say, Robert is your mother's brother.
** now that I think of it, any of my 'not so good bread' goes into bread crumbs, too.