Mine will be having prawns for Christmas. They love them. When I go to put the prawns down for them Alf does a little wriggle/dance of expectation. Its a bit like he's doing the kneading thing they all do but its not quite that. Harvey can smell a prawn being taken out of the packet even if he's upstairs asleep at the time. He just miraculously appears.
Relatively inexpensive and available in all good supermarkets lol.