There are the wildest rumors about the rules for grilling, with which grill and with what coal. Everything is very simple!
Dear visitor, dear visitor,
We are pleased that you are using the nature and relaxation area of Isar. Please follow these simple rules:
Distance of at least 10 meters to trees, shrubs or combustible objects during grilling
Grill charcoal on the floor and wood fire are forbidden
Take care of other visitors: avoid noise
Also think of the residents of nearby residential areas
Avoid sparks. After grilling, remove your embers and leave the ashes completely cold
Please use the provided waste and grill ashtray, which you can easily find on this Isar-Map
Please note: Violations of these rules or the instructions of the responsible personnel can be punished with fines.
(Soutrce  https://isar-map.de/)
Ad your two cents!