The sweet egg-yolk filling exists because convent nuns used only egg whites to starch their habits, and needed somewhere to put the leftover yolks.
A sweet egg-yolk-and-sugar paste is sealed inside a thin wafer shell shaped like shells, barrels or fish. Traditionally sold in small wooden barrels from Aveiro's train station and market stalls to travelers passing through.
Bifana
Sardinhas Assadas (Grilled Sardines)
Caldo Verde