Ask a local about some of the good food spots in Boston. Nobody can tell you about Boston food better than a local. If you are familiar with someone from Boston, ask them where to eat out.
If you don’t get much information from those familiar to you about the food spots, you can ask locals on the streets, in a shopping mall or anywhere you go. Talk to multiple people and make a list of places and particular food items that sound unique and new to you.
Use the Internet
Use the Internet to find great food in Boston. Since you don’t know about any restaurant or a particular food item popular in the city, you can do Google search. Try to use different keywords targeting food in Boston in Google search engine; you will likely come up with several results that can give you enough information about food places and great cuisines in the city.
If you know a particular food website, send them a message asking about the best food in the city.
Read online reviews
Online reviews offer great help to find what you are after. These reviews are written by people who had experienced the food first hand. Read all the reviews carefully and if it is possible to talk to the commenter, to get as much information as you can.
Join food forums
If you have time and can wait for a few days till you find a place/restaurant for best food, you can join food forums. There are plenty of food forums online where you can talk to locals and people who have experienced the best food (in their opinion) in different cities.
Boston is a big place, and you will surely find several people on forums who have been to amazing food joints.