Out of many ways on how to eat, here are a few – one has to follow these instructions before partaking prasadam
Honoring guests
Acamanam
Asanam (Seating)
Preparing the place
Placing the leaf from which food is partaken
Ensuring five parts of the body are wet
Sitting on the place prepared
Most important is related to uttareeyam – upper garment
To learn more in detail about the above 8 points, what entails anna shuddhi (purification of cooked rice), vandanam, etc., before one eats, please refer to the YouTube channel available on this link