Tanaka likes grass that is still in the pot or in this case tray. When he goes for a walk, this will be his first stop. First, the quick look into the box.
My role here is to act as a grass-bringer-outer person. He will wait for me to actually bring one tray out for inspection and approval. This always happens if there are two trays.
Once he has sniffed at and inspected the suitability of the said grass, there will be the first bite.