It is indeed the spirit of your former greengrocer. He is trying to say:
"How many cucumbers would you like to clank?"

Sometimes, when I'm trying to sleep, my water pipes make clanking noises. I can't help thinking that it might be the ghost of my old greengrocer trying to tell me something. What might the following pattern mean?
"Clank. Clank. Ting-ting-clank. Rattle. Clank. Clank. Clank. Clank. T-t-t-ting!"
It is indeed the spirit of your former greengrocer. He is trying to say:
"How many cucumbers would you like to clank?"