Onion emoji is the picture of full onion 🧅 display in skin color. This emoji is basically to add flavors to boost the taste of food. When you cut onions they can make eyes teary so it is also used to show tears. You can send this emoji with Crying face emoji😢.
Note: Onion was formed as a part of Unicode 12.0 in 2019 and labeled Emoji 12.0 in 2019.
:onion: (Github, Slack)