Via the Uber Eats app you can select the “Buy One, Get One Free” promo by clicking on the banner at the top of the app.
You can then view eligible restaurants in your area. And once you select the restaurant you can view their eligible buy one, get one free items. They will be the regular item and say x2 next to the item name.
Some eligible restaurants in Brooklyn include Mazza and More, Yossis Mapelton, Arriba Cafe Mexicano, Glatt ala Carte, and more.
Post what restaurants you find!