The donut ornament is going to be displayed with all the other gifts Nito's gotten since his arrival in Kaisou. ...Don't worry about the teeth marks.

Anyway, in addition to the stuff he gave everyone, for Secret Santa Vash is getting a sizeable cactus from Nito. Specifically, a member of the Optunia genus aka a prickly pear. Attached is a note (in Nito's best attempt at handwriting) that indicates several parts of the plant are edible.