At first glance, sticking cloves into an onion might seem like an old-fashioned kitchen trick with no real purpose. However, this traditional practice has been used in many cultures for generations — both for cooking and household uses.

From enhancing flavor in soups to naturally freshening indoor air, the simple combination of onion and cloves continues to attract attention online because of its surprising versatility.

While some claims about this method are exaggerated, experts say there are several practical reasons why people still use this traditional trick today.

Why Cloves and Onions Work Well Together

Onions and cloves both contain strong aromatic compounds.

Onions

Onions naturally release sulfur-containing compounds responsible for their:

• Sharp smell
• Distinct flavor
• Tear-inducing effect

Cloves

Cloves contain eugenol, a powerful aromatic compound known for its:

• Warm scent
• Spicy flavor
• Traditional use in cooking and herbal practices

When combined, these ingredients create a strong natural aroma that has been valued in kitchens for centuries.

The Traditional Culinary Use

One of the oldest reasons for sticking cloves into onions comes from classic cooking techniques.

In many traditional European recipes, chefs insert cloves into onions before adding them to:

• Soups
• Broths
• Stews
• Sauces

This method helps infuse dishes with:

• Warm spice flavor
• Mild sweetness
• Richer aroma

Why Cloves Are Inserted Directly Into the Onion

Placing cloves into the onion makes them easier to remove later during cooking.

This prevents:

• Overpowering flavor
• Accidentally biting whole cloves
• Uneven spice distribution

The technique is especially common in:

• French cuisine
• Holiday recipes
• Slow-cooked dishes

Some People Use It as a Natural Air Freshener

Beyond cooking, some households place clove-studded onions in rooms because of their strong aroma.

The combination may help:

• Reduce food odors
• Create a spicy scent
• Freshen indoor spaces temporarily

While scientific evidence is limited regarding air purification claims, many people simply enjoy the traditional fragrance.

The Historical Connection to Seasonal Illnesses

Historically, onions and cloves were sometimes used during cold and flu seasons in folk practices.

People believed the strong-smelling ingredients could:

• Clean the air
• Support respiratory comfort
• Repel “bad air”

Modern science does not support claims that onions absorb viruses or “pull toxins” from the air.

However, cloves and onions do contain natural compounds currently studied for:

• Antioxidant activity
• Antimicrobial properties
• Aromatic effects

Can Onion and Clove Repel Insects?

Some people believe the strong smell may help discourage:

• Flies
• Mosquitoes
• Small insects

The scent of cloves especially has been studied for mild insect-repelling properties.

However, effectiveness is usually limited compared to professional insect control methods.

Why Cloves Are So Aromatic

Cloves are among the most intensely aromatic spices in the world.

Their strong scent comes mainly from eugenol, which is also used in:

• Dental products
• Essential oils
• Fragrances

This powerful aroma is one reason cloves remain popular in:

• Cooking
• Potpourri
• Holiday decorations
• Herbal traditions

Onion and Clove in Traditional Cooking Around the World

Different cultures use this combination in unique ways.

French Cuisine

The “clouté onion” technique uses onions studded with cloves to flavor soups and sauces.

Asian Cooking

Cloves and onions are often combined in:

• Curry dishes
• Rice recipes
• Meat marinades

Holiday Cooking

Many winter recipes use cloves for their warm seasonal aroma.

Do Onions Really “Absorb Germs”?

A common internet myth claims sliced onions absorb bacteria and become dangerous overnight.

Food safety experts say there is little scientific evidence supporting the idea that onions “pull toxins” or absorb viruses from the air.

However, cut onions should still be stored safely because they can spoil like any other food.

Why People Still Love Traditional Kitchen Tricks

Simple household traditions often survive because they:

• Smell pleasant
• Feel comforting
• Connect people to cultural memories
• Add flavor naturally

Even when scientific evidence is limited, these habits often remain popular because they are inexpensive and easy to try.

Potential Health Benefits of Cloves and Onions

Both ingredients contain plant compounds being studied for possible health-supporting properties.

Onions Contain:

• Quercetin
• Sulfur compounds
• Antioxidants

Cloves Contain:

• Eugenol
• Polyphenols
• Antioxidants

Researchers continue exploring how diets rich in plant compounds may support:

• Heart health
• Cellular protection
• Inflammation balance

However, no single ingredient works as a miracle cure.

Important Safety Reminder

While onions and cloves are generally safe in normal food amounts, excessive use of concentrated clove oil may sometimes cause:

• Irritation
• Digestive discomfort
• Allergic reactions

Clove oil should be used carefully, especially around children.

Why Social Media Sometimes Exaggerates These Tricks

Online videos often claim onion-and-clove tricks can:

• “Purify” the home
• Eliminate disease
• Replace medicine
• Remove toxins

These claims are usually exaggerated.

Traditional remedies may offer:

• Pleasant aroma
• Culinary benefits
• Mild natural effects

but they are not substitutes for proper medical care or hygiene.

Final Thoughts

Sticking cloves into an onion is a traditional practice that has been used for generations in both cooking and household routines. The combination may help add flavor to soups and sauces, create a pleasant aroma, and provide mild natural insect-repelling effects because of the strong compounds found in cloves and onions.

While many internet claims surrounding this trick are exaggerated, experts say it remains a simple, inexpensive, and culturally rich kitchen tradition that many people continue to enjoy today.