I've been wondering what are mollejas?!

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Molleja is what we call a gizzard in English.
Just to be sure there was not some other meaning in some other Spanish speaking country I looked it up in the Real Academia Espa?ola dictionary which is to Spanish what the Oxford Dictionary of English is to English.

I live and eat in Mexico where we speak Spanish
http://buscon.rae.es/draeI/SrvltConsulta…

In Puerto Rico, the most common type of mollejas are "mollejas de pollo" (chicken gizzards). Gizards are part of the digestive system of the chicken and works in conjunction with the chicken stomach. It is located between the "Proventriculus" also known as true stomach of the chicken and the small intestine. It is like a secondary stomach and has thick muscle walls. Some people do not like that but there are a lot like me that love it.

http://en.wikipedia.org/wiki/Gizzard

Molleja is really the part of an animal you probably don.t eat, but in Venezuela, especially in the western part of the country it is used frequently to express surprise or amazement. Here you might say, "Wow that's awesome" In Venezuelan you will hear, "Que MOLLEJA" and a person who has made a bad choice or is considered disturbed, may be called a MOLLEJON.

CLONTARF You obviously have never been to Maracaibo, Venezuela. Molleja and mollehon are two very popular words. I do understand that they might not be 100% correct Spanish, but they both are in current use.

It is sweetbreat- cows' stomach, pancreas, heart, etc.

http://mywoodenspoon.com/beef-sweetbread…

In Puerto Rico they're chicken gizzards.