For the source text click/tap here: Pesachim 74
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The seventh perek of Massekhet Pesahim deals with how the korban Pesah is eaten. Perhaps the most basic rule about the preparation of the sacrifice is that the animal must be roasted whole. One of the concerns raised in the Gemara is the issue of removing the blood from the meat before it is eaten.
The heart contains congealed blood which is unable to be removed through the salting process. This blood is considered blood that contains the life of the animal and hence carries the penalty of Kareis if consumed .
It is customary to cut the foreskin of the heart and to cut the sinews inside of it. The Shach cites Recanati that this is " to remove the impurity from the heart”
This leads us to examine the status of the heart in the kashering process and the intriguing case of
The Heartless Chicken