Update #: 12
Per Sree's recommendation, I hit up Newton's Circus for dinner tonight. Had the Tiger Prawns (delicious), some Satay (tasty and cheap), a little Sugar Cane and Lemon juice (yum), and finally some Cockles.
The first thing to understand is that a lot of dishes come standard with a bowl of soup. When you order the 'value meal' or 'set' it's assumed you'll get a main dish, some rice maybe, and a bowl of soup. So when I ordered the cockles and there was a small 'soup like' bowl nearby, that's what I assumed it was. After I finished eating, I picked up the bowl and started to slurp from it. Hmmm, kinda cold - but I had let it sit there the whole meal, so I didn't think twice about it.
About half way into my 'soup', a worker yelled from the distance - you're not supposed to drink it! He came over and explained that the liquid in the bowl was there to clean off the cockles before I ate them...
As he was leaving he said "don't worry, you're not the first one to do it."
note - let the record show that the main topic of discussion in this post was cleaning cockles.
Some items that I haven't tried yet (but were on the menus):
Pig Organ Soup, Pig Liver, Pig Stomach, and even Pig Tail.