Types of Onions: Flavor Guide and Best Uses

Ever wondered why some recipes call for yellow onions while others specify red, white, or sweet onions? Although they all belong to the same family, each type has a different flavor, texture, and best use in the kitchen. Here’s a guide to the most common onion varieties, when to use them, and how to choose the right one for every recipe.

Different Types of Onions

Bulb Onions

Dry or bulb onions include spring/summer sweet onions, such as Vidalia and Bermuda, and the stronger-flavor, fall/winter storage onions, such as Yellow Globe. They may be white, red, or yellow and are harvested after the tops have died down. 

Sweet Onions

Sweet onions have thin skins and a mild taste that makes them perfect for eating raw or using in briefly cooked dishes. 

Storage Onions

Storage onions have thick layers of skin, are more pungent, and do well in dishes that cook for a while.

Red Onions

Red onions are usually the mildest and often are eaten raw or grilled. 

White Onions

White onions are a bit more pungent and often are sautéed and used in salsas or Mexican cuisine. 

Yellow Onions

Yellow onions have the strongest flavor; they are great for soups and other cooked dishes.

Green Onions

True green onions, also called bunch onions, are bred specifically to have a small bulb and long stalks, both of which are edible. (Scallions fall into this category.) You can also use a dry onion as a green onion by harvesting the young green tops before the bulb has grown to full size.

Shallots

Shallots are milder than onions and are often used in French cooking. The small bulbs grow in sections called cloves, similar to those of garlic. The skins can be reddish brown, yellow, or gray.

Pearl Onions

Pearl onions are small (about 1 inch wide), mild onions with red, white, or yellow skins. Although commonly pickled and used in cocktails, they also can be cooked as a side dish or added whole to stews and casseroles.

Gardeners often grow both sweet onions for fresh summer eating and storage onions for winter use. Choosing the right variety lets you enjoy homegrown onions for months after harvest. Learn how to grow onions in your garden.

Onion Flavor Guide

Best Onion for…

• French onion soup → Yellow onions
• Burgers → Red onions
• Salsa → White onions
• Caramelizing → Yellow onions
• Salads → Sweet or red onions
• Stir-fries → Green onions
• Roasting whole → Pearl onions

Frequently Asked Questions

What is the sweetest onion?

Sweet onions, such as Vidalia and Walla Walla, have a high water content and low sulfur levels, giving them a mild flavor.

Which onion is best for cooking?

Yellow onions are the most versatile and are ideal for soups, stews, roasting, and caramelizing.

Are scallions and green onions the same?

Generally, yes. Scallions are a type of green onion harvested before a large bulb forms.

What’s the difference between shallots and onions?

Shallots grow in clusters of cloves, have a milder flavor, and are commonly used in dressings, sauces, and French cuisine.

Which onions store the longest?

Storage onions, especially yellow varieties, can last for several months when cured and stored in a cool, dry place.

Can you substitute one onion for another?

Usually yes, although the flavor will change. Yellow onions are the most versatile substitute.

Whether you’re growing onions in the garden or choosing them at the grocery store, understanding the differences between onion varieties makes it easier to select the right one for every recipe. From sweet summer onions to long-lasting storage onions, each type brings its own flavor and strengths to the kitchen.