Cut it into 3" x 3" x 6" pieces. Wrap and label "fruitcake".
Send packages out as gifts.
With no fear of it being eaten, or, in most cases, opened, before
disposal.
That's similar to my should-have-patented method for disposal of
nuclear power plant waste: t my suggestion was for the power companies
to mail their stockholders their "dividend" every quarter and let them
deal with it locally.
Another similar method is being used by the car and truck tire
industry to dispose of some of their waste. The tires are ground into
small pellets and spread on outdoor athletic fields all over the
country. Eventually the pellets follow a path through the athetes'
shoes and clothing into their homes and eventually legally into
landfills where whole tires are forbidden.