Thai Red Onion has a brighter reddish color than a purple onion (Bermuda onion) and definitely a sharper onion tang than its purple or brown cousins. Hom-daeng (onion-red, literal translation from Thai) have a purplish-red outer paper skin, and a generally stronger smell, a more pungent aroma than the yellowish-orange variety, which is milder in scent and sweeter to the taste.