First of all, remember that when buying vegetables it is important to pay attention to numerous details. For example, the color, size, smell and texture can indicate the quality of the products, showing which are in perfect condition.
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That said, avoid buying vegetables that are withered, bruised, rotten or show signs of pests and diseases. As to onions stained, it is essential to be guided by the external appearance, prioritizing whole and unpeeled roots.
Firstly, a fresh onion has a dry and firm skin, without spots or holes. Therefore, it must be heavy in relation to its size and have a soft, sweet smell, as the slightest sign of rot causes bad odors.
Then, when preparing any meal, check whether the inside is white or purple, depending on the variety. That said, expect a transparent appearance and no signs of sprouting or mold, linked to decomposition.
This infection is caused by a fungus called Alternaria porri, which attacks the leaves and bulb of onions. Therefore, it is possible for the infestation to occur on the plantation or during storage in markets and supermarkets.
The foliage becomes yellowed and dry, and the base reveals dark, moist spots. Unfortunately, it is impossible to cut out the affected area and save what remains, due to the risk of contamination after using utensils in the kitchen.
Finally, it is worth mentioning that fungi produce toxic substances called mycotoxins, which cause allergies, poisoning, infections and even cancer. Although it is just a risk, prevention must be taken into account.
Furthermore, the action of microorganisms alters the flavor, aroma and texture of food, making it unfit for consumption. For this reason, it is recommended to discard contaminated food.
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