Balsamic Caramelized Onions | The Best Caramelized Onions Recipe (2024)

FAQs

What is the trick to caramelizing onions quickly? ›

You can use either oil or butter to caramelize onions — but ideally, you use a combination of both! I like to use olive oil, and this cooking fat tolerates heat particularly well. Meanwhile, butter adds a distinctly rich flavor to the caramelized onions.

Tip: use apple cider vinegar for white and yellow onions and balsamic vinegar for red onions. Tip: the vinegar serves to deglaze the pan, adds acidity, and brings this recipe together by boosting the tangy and savory flavors of the caramelized onions. If the onions stick to the pan, that's fine.

After 10 minutes, sprinkle some salt over the onions, and if you want, you can add some sugar to help with the caramelization process. (I add only about a teaspoon of sugar for 5 onions, you can add more.) One trick to keeping the onions from drying out as they cook is to add a little water to the pan.

Yes, you should cover the onions when caramelizing them. Covering the onions helps to trap the steam and heat, which aids in the caramelization process by softening the onions and allowing them to release their natural sugars. This results in a sweet and flavorful caramelized onion.

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.

Depending on the consistency you want your onions, you can use more or less fat. Just cover the bottom of your pan for jammy, soft caramelized onions, or add a little more for more structured, slightly charred caramelized onions. The more fat in the pan, the more the onions will fry rather than soften.

You can caramelize any kind of onion, but yellow or Spanish onions tend to offer the most balanced-sweet-savory flavor profile and are the most versatile for different dishes. Sweet onions, such as Vidalia or Walla Walla work too, but keep in mind that their flavor will become even sweeter once caramelized.

You don't want to slice them too thin or they'll cook too fast which could cause them to burn. You'll also want to start out with fat. I choose oil and butter. Butter gives it a good flavor and helps with the caramelization and the oil helps the butter not to brown too fast.

If the onions aren't deeply brown after 50 minutes and you'd like to speed things up, you can turn the heat higher to get more caramelization. Stir continuously to prevent burning.

Do you constantly stir caramelized onions? ›

For even cooking, and to prevent burning, it's essential to check and stir the onions every five to 10 minutes. And if you don't feel like you're quite up to the task, you can also try making caramelized onions in the slow cooker.

Squeeze some lemon juice or vinegar into the dish. The acidity helps to neutralize the onion flavor.

Using baking soda to caramelize onions

Stir it in at the end of cooking for about 1 minute. Adding it too early will break down the onion fibers, turning them into mush.

When you add baking soda during cooking it changes the pH which increases the Maillard reaction causing the onions to brown more quickly. The higher pH also causes the onions to soften more quickly, which we cover below when we discuss the texture.

The baking soda speeds up the Maillard reaction

According to cookbook author and food writer Kenji López-Alt, you can speed up the process of caramelizing onions by adding a pinch of baking soda (via Serious Eats).

The baking soda speeds up the Maillard reaction

According to cookbook author and food writer Kenji López-Alt, you can speed up the process of caramelizing onions by adding a pinch of baking soda (via Serious Eats).

The key is to cook at a low heat for at least 20 minutes until the onions are really soft and form almost a thick stew of its own juices. Then turn up the heat and stir constantly for 20 more minutes until the onions are brown. If you try to heat the onions too quickly in the beginning, they will just burn.

A few reasons could be that you sliced them too thick or too thin. You haven't cooked them long enough. Your heat isn't at the right temp, use between medium and medium-low. Adding too many onions at once can actually cause them to steam because of too much moisture, instead of caramelizing.

Put the onions in the bowl with the fat or butter. Cover the bowl and microwave for 10 minutes on high. Take off the cover, and stir the onions--there should be good bit of liquid in the bowl. Microwave (uncovered) for approximately 10 more minutes, but keep an eye on it.