A two liter bottle of barbeque sauce that was poured on the ground, presumably on purpose (by a child?) because the intact bottle was on the ground nearby and I don't see how you could spill so much by accident out of the small opening in the bottle. Then a guy from the council whipper snipped along the edge of the lawn by the bus stop and lots of grass clippings stuck to the mess, along with a straw and a tissue.
It looks like someone has dropped a jar of jam at the bus stop, and it never got cleaned up....maybe it just became very sticky, and in time grass and leaves were placed over it, so people would not get it on their shoes?
I have seen something very much the same myself.I think if it was, the glass jar may have been picked up....
Was it a cup of juice or iced tea that was dropped and spilt everywhere? That would explain the straw.... not sure how the grass and leaves got there.... unless Jonaj is right about that bit and they were put there deliberately to mop up some of the mess.