пиёз

Бисёр таомҳои тоҷикиро бо пиёз мепазанд.
Many Tajik dishes are cooked with onions.
Аввал гӯшт, пиёз, сабзиро бирён мекунанд.
First fry the meat, onions and carrots.

Bonus:
Notice that both of today’s sentences are written in the third person plural, but not translated into English that way.
Sentence #1: In Tajik the passive tense is not used as much as in English. The third person plural is usually used instead.
Sentence #2: In Tajik recipes are usually written in the third person plural, whereas in English they are usually written in the imperative.

пиёзи сабз: green onions
пиёзи ансул (or пиези анзур): Persian shallot

Short article about onions from the Tiroz website: Оё медонед ки пиёз қариб 500 намуд дорад (Did you know that there are nearly 500 types of onions).