Why My Grandmother Always Puts a Nail in the Onion – A Surprising Old Trick

3. Enhances Onion’s Antibacterial Properties
Onions are natural disinfectants, and iron may enhance their antimicrobial effects
Used in some folk remedies to treat infections & purify water
A common trick in natural medicine practices
Some believe that placing an iron nail in an onion overnight increases its medicinal benefits!

4. A Traditional Cooking & Pickling Trick
Used in old-fashioned pickling recipes to deepen color & flavor
Iron reacts with natural acids, making onions and pickles crispier & more vibrant
Helps preserve onions longer in homemade vinegar brines
Try adding a rusty nail to your next batch of homemade pickles for a color-enhancing effect!