The Best Way to Make Caramelized Onions, According to Our Test Kitchen (2024)

FAQs

The Best Way to Make Caramelized Onions, According to Our Test Kitchen? ›

The trick is to leave them alone enough to brown (if you stir them too often, they won't brown), but not so long so that they burn. After the first 20 to 30 minutes you may want to lower the stove temperature a little, and add a little more oil, if you find the onions are verging on burning.

The trick is to leave them alone enough to brown (if you stir them too often, they won't brown), but not so long so that they burn. After the first 20 to 30 minutes you may want to lower the stove temperature a little, and add a little more oil, if you find the onions are verging on burning.

Our Test Kitchen likes to use butter when caramelizing onions, as it offers the richest flavor. If you avoid dairy or don't have butter, you can caramelize onions in other fat such as margarine or olive oil. Add the onion slices. It's okay if they overlap a bit here because they'll shrink as they cook down.

Choosing Your Ingredients and Tools for Caramelized Onions

In terms of the more commonly available options, my favorite is butter. Because it contains milk solids, it kicks off the browning process more quickly than vegetable oils do, and it glazes the onions more beautifully.

We also have to watch out for burning. And it's too easy for part of the onion to burn while the rest is still trying to brown. Putting a lid on will steam the onions and cook them more evenly.

In addition to water, we have another secret ingredient: baking soda. We often turn to it to speed browning, since it creates a high-pH environment, which allows caramelization to occur more readily. Baking soda is also handy for softening vegetables because altering the pH helps weaken their cell structure.

Stirring the onions and scraping down the sides of the pan often to ensure no strand darkens faster than another is key. A heatproof rubber spatula is the tool for this job; it's stiff enough to scrape the bottom of the pan and flexible enough to clean the sides.

Unlike mushrooms, which shouldn't be salted until after they've browned, you should always salt onions before you start cooking them. Onions won't begin to caramelize until all the water in them has evaporated, and using salt will speed up that process, Caicedo explains.

Caramelized onions should be far darker than golden in color. → Follow this tip: Cook times will vary depending on the number of onions you're cooking and the type of onion (its sugar content and age), but plan to cook caramelized onions for 40 to 50 minutes (at least) until they have a dark-brown, rich color.

Tips. Oil – Use just one tablespoon of oil or butter per onion, or the sautéed onions can become too greasy. Be sure to put a lid on the sauté pan – this speeds up the cooking and helps the onions retain their moisture.

Why do you add water to caramelize onions? ›

The water moistens the onions and helps dissolve sugars to prevent burning. When the onions begin to brown, lower the heat and stir periodically. A finished batch of caramelized onions should be a rich brown color, greatly reduced in size from the beginning of the process, and soft (but not mushy).

While you can start the cooking process at medium heat, low and slow is the name of the game when it comes to caramelizing onions. Once your onions begin to soften and take on a golden hue, you'll want to reduce the heat from medium to medium-low or even low for the remainder of the cooking process.

Simply put, caramelized onions aren't quick. It takes at least 45 minutes (and often over an hour) over low heat for the natural sugars in the onions to caramelize. Still, the time is totally worth it. Packed with irresistible umami flavor, caramelized onions add complexity to all sorts of savory dishes.

You're not sautéing your onions—you're trying to slowly coax flavor out of them. It takes time, probably a solid 45 minutes, for the onions' sugars to caramelize. If your heat is too high, the onions will burn. Heat your pan over medium-low, then add your onions.

But the best shortcut to cook a large batch of onions and turn them into caramelized onions is to pressure cook them. With no added water, it doesn't do the conventional steam cooking but instead does an accelerated caramelization (which works much faster in a high pressure environment).

Simply put, caramelized onions aren't quick. It takes at least 45 minutes (and often over an hour) over low heat for the natural sugars in the onions to caramelize. Still, the time is totally worth it. Packed with irresistible umami flavor, caramelized onions add complexity to all sorts of savory dishes.

Sautéing is about softening and lightly flavoring the onions, while caramelizing is about developing a rich, sweet complexity. Unfortunately, you can't swap one out for the other without changing the flavor profile of your dish. Sautéing onions quickly brings out their natural flavors while maintaining some brightness.