You'll need either 1 pint of shucked clams or two 6.5-ounce cans minced clams. If you're using fresh clams, drain the clams, reserving the juice. If you're using canned clams, drain them, reserving the liquid.
The green-coloured organ in the interior of bivalve molluscs (oysters, mussels, clams, scallops) is the hepatopancreas. This is an organ of the digestive tract that provides the functions corresponding to those performed separately by the liver and pancreas in vertebrates.