We continue with the subject of pickling, and move on to Mishnah 10 in chapter 10 of Maseches Terumos. The Mishnah deals with vegetables pickled together in a single vessel - cabbage, green tomatoes, cucumbers and the like - when some of them are Terumah and some are chullin.
The words of the Mishnah: "Kol hanichbashim zeh im zeh" - all items that are pickled together, the ruling is that they are permitted.
This wording needs precision, and it is worth writing a note in the margin of the Mishnah: the word "kol" (all) can be misleading, since the intent is not to everything that is pickled, but to vegetables alone - ordinary, general vegetables.
Therefore, if Terumah cucumbers were pickled in a jar together with cucumbers that are not Terumah, or green tomatoes and anything similar - they are all permitted. Obviously the Terumah component itself remains restricted and must be given to a kohen, but as for the rest there is no concern about taste being released, because vegetables are bland by nature and pickling does not have the power to spread a taste that carries halachic significance.
The exception - chasiyos:
The Mishnah excludes from this rule the chasiyos (in English: alliums). The reference is to the sharp onion family of vegetables: onion, garlic, leek, scallion and the like. These vegetables have a sharp taste, and when they are the Terumah - they release their taste, and the entire mixture becomes forbidden and restricted with the status of Terumah.
The Mishnah here, then, is dealing with a mixture of ordinary vegetables pickled together with chasiyos. Despite the many details in its wording, the underlying principle is a single one: chasiyos release strong tastes, while other vegetables release no taste. For this reason there is a concern only when the source of the prohibition is the chasis, that is, the onion.
The cases in the Mishnah:
"Chasis shel chullin" with a chasis of Terumah - a chullin onion pickled in a jar with a Terumah onion: forbidden.
A chullin vegetable with a chasis of Terumah - an ordinary vegetable, such as green tomatoes, pickled with Terumah onions: forbidden. In both of these cases the onion is the Terumah, and it emits a forbidden taste, and therefore the entire mixture becomes restricted as Terumah.
A chasis of chullin with a vegetable of Terumah - here the onion is the permitted component, while the restricted component is an ordinary vegetable, such as cucumbers or green tomatoes. Even though those cucumbers and tomatoes are Terumah, since they are ordinary vegetables they do not release taste, and therefore the entire mixture remains permitted and unrestricted, and a non-kohen may eat it.
In summary: in this Mishnah we learned that vegetables pickled with one another are permitted, because they lack the power to spread taste through pickling. The exception is the chasiyos - the sharp onion vegetables - whose taste is strong and is released; therefore whenever the chasis is the Terumah, the entire mixture becomes forbidden, whereas when the chasis is chullin and the Terumah is an ordinary vegetable, the mixture remains permitted.