Botanical atlas

Onion

Allium cepa

Few plants have followed humanity as faithfully as the onion. Egyptians revered its concentric rings as a symbol of eternal life, Greek athletes rubbed onion juice on their limbs before competition, and cooks in nearly every culinary tradition have built their pots on a base of onion, believing it strengthened the blood and warded off sickness. Folk healers traditionally simmered onions into syrups for coughs and tied warm onion poultices over the chest to ease congestion, a practical grandmother's remedy passed down long before anyone understood why the bulb bit back at germs. It has always been as much medicine cabinet as pantry staple.

Safety.

Onion is a safe, everyday food. In medicinal or concentrated amounts it may enhance the effect of blood-thinning medication, and it's toxic to dogs, cats, and other pets, so keep bulbs, skins, and scraps away from them.