Schiller Burger is for me one of the best burger chains in (and from!) Berlin. I discovered them in Neukölln and was delighted to find them in Weißensee when I moved to the neighboorhood. I might become a regular there.
In this district, they’re located very close to the lake, right by the tram stop Albertinenstr (M4, M13 and 12).
I can’t talk for the veggie options since I’m a beef lover, they use meat of great quality, cooked perfectly, juicy. All ingredients are fresh, the staff is super friendly, the sweet potatoe fries are amazing. It might look expensive, but it’s really worth the price, it’s more than burgers, it’s a party for my taste buds. Really love it. And if Weißensee is too far away, check out one of their other locations.