Each town that housed a convent has their own specialty sweet treat. The nuns needed something to do with the yolks after starching their clothes with the whites, so they made treats with the egg yolks. Obis moles are specific to the Aveiro District and come in many fun shapes like clams, fish and sea shells. It tastes like a really thick custard and don’t expect to be able to eat THAT many at a time. In Aveiro, you can find ovos moles as a filling inside tripas and even as an ice cream flavour!