The body must be buried without being cut up. Even an autopsy should be avoided if possible. Composting which is the treating of a body as if it is garbage to be disposed of is most similar to cremation.
If some of the limbs were severed and left unburied, the Mitzvah of burial is not fulfilled, as ruled in the Jerusalem Talmud, Tractate Nazir 33a.
For example The Interment By Maurice Lamm
Jewish law is unequivocal in establishing absolutely, and
uncompromisingly, that the dead must be buried in the earth. Man's
body returns to the earth as it was.
The blood and limbs of an individual are considered by Jewish law to
be part of the human being. As such, they require burial. If the
deceased was found with severed limbs, or with blood-stained clothes,
both the limbs and the clothes must be buried with him.
If limbs were amputated during one's lifetime, they require burial in
the person's future gravesite. If he does not own a plot as yet, or if
he is squeamish in this regard, it should be buried in a separate
plot, preferably near the graves of members of his family. The limbs
are cleansed and placed in the earth. No observance of mourning is
Donation of Limbs to Hospitals
Jewish law generally discourages contribution of one's limbs to
hospitals. If one has absolutely stipulated that a limb be donated for
medical research, the question of following his will depends on many
details, and requires rabbinic research. It is best, therefore, to
consult an expert on Jewish law. At any rate, even if it were
permitted, the limb would require burial when it is no longer in use
by the medical institution.