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No, prosphora is not intended to be bought or sold! Prosphora is an offering, prayerfully baked by a parishoner, never for pay. Part of the bread becomes the Body and Blood of Jesus Christ in Holy Communion, and part of the bread is set aside for antidoron and distributed after Divine Liturgy. Sometimes some of this bread is taken home and eaten by those who offered it.
How should prosphora be eaten?
Prosphora is blessed bread and should be handled and eaten with due reverence. Those eating it should take care not to drop crumbs on the floor, and the paper in which it was wrapped should be burned rather than thrown in the rubbish. Any crumbs that fall should be collected and either eaten or burned with the paper. Children eating prosphora should be carefully supervised. From ancient times it has been the custom to eat prosphora on an empty stomach, often with Holy Water or, if appropriate, a little sweet red wine.
Who may take the wrapped prosphora at the end of the service?
The wrapped prosphora may be taken by those who offered them. When this has been done, any prosphora left over may be taken by those who wish to have them.
(Link to source, Saint Panteleimon Russian Orthodox Church, West Gosford, and Saint Nicholas Russian Orthodox Church, Wallsend, Australia)