Cooks Gathering Lunch?

Now now, I know that the tennis center where our kindergarten is situated suffers from  money problems, but the sight this morning caught me off-guard. All the cooks, in full kitchen attire, plus hats, are on the camp grounds picking unidentified green things. Together with them is the canteen boss, two cleaning ladies, and god knows why, the accountant. 

All squatting down and inspecting intently the grass. 

I really hope we won't be eating the result of their work at lunch.