yeah, i never heard of mallomars. i just googled it and its some sort of chocolate cookies. Here is the pic:
this mallomars remind me of this chocolate cookies that my mom bought every once in a while but i can't remember the name. it has the similar look with chocolate on the outside and cream on the inside.
i am not sure if pork roll is available in my area because i am vietnamese of chinese descend and my family rarely eat in american restaurants. i have a mild case of social anxiety disorder so i get nervous when i went to restaurants that i am not familiar with to order food. even the restaurants that i frequent go to, i am also a bit nervous but at least i know what food to order to eat. so i am not that familiar with american foods but according to pic that you posted, it looks like McMuffin sandwiches sold by McDonald.
Here is the pic:
after looking at the pic, its kind of look different to your pork roll. the sandwiches' breads are different. according to how you call it pork roll, i suppose you live in southern part of new jersey.
added: i just noticed the egg mcmuffin has different meat in it. this pic, it has sausage meat while some pics has ham in it i think.