Spanish onion
US /ˈspæn.ɪʃ ˈʌn.jən/
UK /ˈspæn.ɪʃ ˈʌn.jən/

1.
oignon espagnol
a large, mild, sweet onion, typically with a yellow or brown skin, often used in salads or for cooking where a less pungent flavor is desired
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For the salad, slice a Spanish onion very thinly.
Pour la salade, coupez un oignon espagnol très finement.
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The recipe calls for a large Spanish onion to add sweetness.
La recette demande un gros oignon espagnol pour ajouter de la douceur.