Best burger ~ Try Bogies @ Downtown Crossing. It's a pretty jazzy, little gastro pub. Do not waste your time going to Wahlburgers.
Best pizza~ Try Santarpios or Piccos. If you like authentic, Italian pizza...you will be so happy. I am happy just telling you.
Best Italian ~ Assaggio over on Prince St. It's a very charming, bi-level restaurant. I would describe the food as Italian comfort food and I loved it. Fyi I've been several times.
Also a great pick for Italian outside of the city is Charcoal Guidos in Waltham. Chris has really done a fantastic job. Small place...you don't have to walk through oceans of people to get to your table. Local, FRESH ingredients 😊 and the food is slammin. I've been many times and will continue to go.
Best Steak ~ I have eaten at a number of truly wonderful steak houses. Some are just head and shoulders above the rest. Through a friend of mine I had the pleasure of shaking hands with blank over on Beacon at Mooo. Unforgettable experience on a personal and palatable level. I could cut the filet with my fork. Need I say more?
Seafood fucking REALLY?!?!?! over and over again my favorite spots are going frozen. The old buyer for legals...who bailed when they went frozen now owns Three Buoys in Portland and Saco ME. Nothing fancy but the food comes out of the Atlantic Ocean daily. The portions are ridiculous and the prices are not astronomical.
For your specialty food (biryani) head over to Cambridge. The name of the place is Suvaai.
I will attach my link reach out if you have any questions. Enjoy Boston