Panne Siciliano

 Panne Siciliano

Panne Siciliano - crumb

I found the flavour and texture to be better the next day (and not in the 2 hours after baking), and there was a little sourness. Is the durum flour meant to be sour? (My "sourdough" is not really sour and it's not previously imparted any sourness to breads).