When you buy onions, you may not know how to tell when an onion is terrible. While the smell of onion is the first sign, the texture and color of the flesh can also reveal the quality of the vegetable. The most common sign of a lousy onion is the brown spots and mushy neck, so you should throw them out. A slightly squishy or limp onion is also a red flag.
A lovely onion has no brown or black spots and is solid, and it isn’t overly soft either.