Add the molluscs and return to a simmer.
The molluscs are aggressive if provoked and their poison-loaded harpoons can penetrate wetsuits.
Cover and simmer vigorously for about 5 minutes, or until the molluscs open up.
When it comes to the battle of the molluscs, cephalopods win tentacles down.
It makes the squid more difficult to see by predators looking for the molluscs from deeper depths.
The pair were struck by the molluscs' brilliant patterning and decided to study their optical properties.
The molluscs produce proteins which combine with ions of calcium and carbonate in seawater.
The idea was that the molluscs would be painted in vivid colours to attract the attention of an underwater Castro.
Because of incompatible safety regimes: America tests oyster waters for bacteria while the European Union examines the molluscs themselves.
The molluscs are the first non-insects found to use such farming methods, reports this week's Proceedings of the National Academy of Sciences USA.
Some people like to add a tablespoon of cornmeal to the water to help the molluscs get rid of the sand in their shells.
