Hi - I'm a big fan of the Ironbound district in Newark. Lots of great Portuguese/Latin American/Spanish fare. There are tons of choices and Im sure some deliver, but if you have the chance, you should take a drive over.
List of restaurants by cuisine :
One of the more popular places is Iberia :
If you provide the information on where you are actually staying will aid in deciding what options are available to you. You have Newark to the north and Elizabeth in the south. Both can offer nice recommendations, but the distance between the two and your hotel can be over 5 miles and out of a delivery area. Also, will you have a car, and if so, how far are you willing to travel to pick something up.