Vidalia onion
US /vɪˌdeɪ.li.ə ˈʌn.jən/
UK /vɪˌdeɪ.li.ə ˈʌn.jən/

1.
a sweet, mild onion grown exclusively in a specific region of Georgia, USA, known for its low sulfur content and distinct flavor
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For the best onion rings, always use a Vidalia onion.
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She made a delicious salad with fresh tomatoes and sliced Vidalia onion.