The Onion Obsession: Why We Can’t Get Enough

Onions, onions, onions. They’re everywhere. In soups, salads, sandwiches, and even on their own as a side dish. But have you ever stopped to wonder just why these bulbous vegetables are so darn popular?

Well, let me tell you, the secrets in the sulfur.

The Flavor Factor

Onions have a distinct, pungent flavor that can add depth and complexity to a dish. But why do they taste the way they do? The answer lies in the sulfur compounds found in onions.

These compounds are responsible for the characteristic odor and taste of onions. When the cells of onion are broken, enzymes convert the sulfur compounds into chemicals that give off that familiar oniony smell. And it’s not just the smell that packs a punch – the taste of onion can range from mild and sweet to sharp and pungent, depending on the variety and how it’s cooked.

The Science of Sulfur

When we cut an onion, we’re actually releasing enzymes that convert the sulfur compounds into volatile molecules that float up to our noses and eyes, causing us to tear up.

But it’s not just the enzymes that are responsible for the sulfur compounds. They’re formed during the onion’s growing process, as the plant takes in sulfur from the soil. The more sulfur in the soil, the more sulfur compounds in the onion. And that’s why onions grown in certain regions can have a stronger or milder flavor than others.

The Magic of Caramelization

Onions are also a popular ingredient because of the way they caramelize. Caramelization is the process of browning sugar, and it’s what gives onions their irresistible sweetness and depth of flavor when they’re cooked.

The natural sugars in onions break down and combine with the amino acids when heated, resulting in that lovely golden brown color and rich flavor.

The Versatility Factor

Another reason for onions’ popularity is their versatility. They can be used in a wide variety of dishes, from sweet to savory, and can be cooked in many different ways.

The Raw Deal

Raw onions can also be thinly sliced and added to sandwiches and burgers for added crunch and flavor. They can be mixed with other vegetables, such as tomatoes, cucumbers, and peppers to make a refreshing salad.

Raw onions can also be mixed with vinegar, sugar, and seasonings to make a pickled onion that can be used as a condiment on sandwiches or as a topping for tacos, burgers, or hot dogs.

The Cooked Conundrum

Cooked onions can also be added to casseroles, stews, and curries to add a depth of flavor. They can be caramelized and mixed with other vegetables, such as mushrooms and bell peppers, for a delicious side dish.

Cooked onions can also be blended into a paste and used as a base for a flavorful marinade for meats or as a spread for sandwiches.

The Allium Army

Onions can be used in combination with other members of the allium family, such as garlic and leeks, to create a harmonious blend of flavors in dishes like soups, stews, and casseroles.

They can also be used in combination with other ingredients to make flavorful marinades, dressings, and rubs. Shallots are often used as a substitute for onions in some recipes for a milder taste and a subtler flavor.


Onions may bring tears to our eyes and make our breath smell, but their popularity is undeniable. The flavor and versatility of onions make them a staple ingredient in many dishes, and the secret to their success is in the sulfur compounds.

So next time you’re chopping up an onion, remember to thank that sulfur for giving you that delicious flavor. Now excuse me, I’m off to make a caramelized onion pizza.