Just read this on DS:
"They have a secret code - cracked by Justine10 and BB.
Chocolate = Charley
Lemon = Nicky
Toast = Tracey
When they come out of the DR they make a reference to two of them and so the others know how to nom.
When Chan came out she said to Zig she wanted hot chocolate - telling him to nom Charley but he didn't hence the row."
I had no idea!