SLOKA OF THE DAY:
Bhagavad Gita As It Is -
Chapter 3 Text 13
bhunjate te tv agham papa
ye pacanty atma-karanat
yajna-sista--of food taken after performance of yajna; asinah--eaters; santah--the devotees; mucyante--get relief; sarva--all kinds of; kilbisaih--from sins; bhunjate--enjoy; te--they; tu--but; agham--grievous sins; papah--sinners; ye--who; pacanti--prepare food; atma-karanat--for sense enjoyment.
The devotees of the Lord are released from all kinds of sins because they eat food which is offered first for sacrifice. Others, who prepare food for personal sense enjoyment, verily eat only sin.
These last few slokas state a principle that is standard to all religious thought; we can only offer to God that which God has given us for we have nothing else.
For the standard prayer used for offering food to Lord Krishna please see my entry; Sloka of the Week, June 9, 2012. I also was taught that one can simply say the Maha-Mantra three times before partaking.