I went to Jim's for the second time and it was all perfectly delicious. We ordered a vegan quesadilla (as far as I know the only German place who serves them!!!) with pickled cactus and a burrito with baby spinach, as I knew I wouldn't be able to finish one with tofu or seitan.
Both dishes were super delicious, the vegan cheese (Wilhelmsburger) melted perfectly and we ate everything leaving no crumb. I especially liked that there were mostly veggies and not too much (stuffing) rice in my burrito, very well done!
The staff is fun and friendly and we hardly waited ten minutes for our food to arrive although the place was full.
Next time in Hamburg we'll surely pay another visit.