Skip to Content

Roasted Vidalia Onions

Share the research:

Roasting brings out all the glory of Vidalia Onions and a long roast brings about a caramelization of the sugars that occur naturally in the onions. In my Roasted Vidalia Onions recipe, I finish with balsamic vinegar to create a sauce for the onions adding to the flavors. The flavors are distinctive and strong. I suggest half an onion as the perfect serving size.

Roasted Vidalia Onion at an angle
Balsamic Vinegar Sauce is a perfect finish

I love cooking Vidalias. If I am lucky enough to have the greens attached, I cook Vidalia Lemon Chicken. and I have used them in many other dishes. But as you will see here, they are excellent as a dish to themselves.

Why Vidalia Onions?

The mystic around Vidalia Onions resembles the mystic around a fine wine. The onions are a product of soil, climate, techniques, and care from the growers. These are the same characteristics used to discuss great wines. Vidalias are named after and are grown in and around the city of Vidalia, Georgia: part of the Georgia coastal region. The soil is low in sulfur and the climate features warm days and cool nights. The exact terms to discuss fine wine regions. All the conditions add to the sweet flavor and the soft, moist texture that make the onions famous.

Yes, you can use other onions, but I have found Vidalias to be better. Of course, they are a local product for me and availability is likely better for me. Regardless, any sweet onion will work.

Notes on Ingredients

Balsamic Vinegar

I use high-quality Balsamic Vinegar. Not too acidic, a vinegar that one would think is perfect for a salad dressing.


Salt is imperative to this dish. That may sound a bit strange to need to discuss salting, but it is required to offset the sweetness of the onion. The recipe calls for salting two times. Salt the onion before cooking with the skins still on the onions. However, the interior will not get enough of the salt. After the onions are cooked and opened, salt directly on the revealed inter flesh of the onions.

Vidalia Onions - oiled and salted for roasting
Oil and Salt and Place in an Oven Proof pan

Notes on Technique

Low and Slow

I roast the onions at 375°F (190°C), for at least an hour. This allows the sugars to carmelize thoroughly through the whole onion and ooze a fond unto the roasting pan. The sugary fond is deglazed with balsamic vinegar to create a sauce.

Roasted Vidalia Onions in Pan
Roasted Onions – that dark sugary fond is going to taste great

Skin On

Roast the onions with the skin on to seal in the flavors. The skin is tough and not edible but creates a type of shell to serve the onions on when finished.

Roasting Pan

The technique requires a thick pan. Suitable for both the oven and stovetop. A cast iron skillet works well or an Au Gratin pan.

A practical consideration, the Au Gratin pan shown with the white finish allows you to see the fond better and measure the thickness of the sauce while you work.

Related Posts

Roasted Vidalia Onion at an angle

Roasted Vidalia Onions

Yield: 4 Servings
Prep Time: 5 minutes
Cook Time: 1 hour
Total Time: 1 hour

Roasting brings out the best


  • 2 Vidalia Onions
  • olive oil
  • Salt
  • balsamic vinegar


  1. Preheat oven to 375°F (190°C). Leave the skins on the onions, but remove any significantly long roots, remaining green stalk, and loose skin. Coat the onions with olive oil and then spread salt on the skins.
  2. Place the onions on a cast iron or similar oven-proof skillet.
  3. Roast in the oven for 60 minutes until tender and the onions are releasing a caramelized fond on the bottom of the pan.
  4. Remove onions from the pan and set aside. Deglaze the skillet with the balsamic vinegar dissolving the fond and the sugars released by the onions.
  5. To serve, cut down vertically through the onions producing two halves. The outside skin will be too tough to eat, but when served it can work as a kind of shell for the softer roasted insides. (If desired you can discard the skins and only serve in the interior.)
  6. Half an onion can serve as a portion. Serve skin side down, and flatten slightly as needed. Salt the interior well and then drizzle the balsamic sauce on top.
Nutrition Information:
Yield: 4 Serving Size: 1
Amount Per Serving: Calories: 86Total Fat: 4gSaturated Fat: 0gTrans Fat: 0gUnsaturated Fat: 3gCholesterol: 0mgSodium: 120mgCarbohydrates: 13gFiber: 1gSugar: 9gProtein: 1g

Calculated Nutrition is estimated.

Share the research:

Laurie Griggs

Monday 4th of March 2024

I never tried roasting them whole. I loved this technique. So good!


Monday 4th of March 2024

This was absolutely incredible! I have never prepared onions like this before and it was so good! The balsamic vinegar at the end was my favourite part of this dish.


Monday 4th of March 2024

This sounds like it will be so flavorful! Will have to try this one.


Sunday 16th of April 2023

These were so good. We served them with roasted chicken and it was delicious

Sage Scott

Saturday 15th of April 2023

I SOOOOO love cooked onions, because they add so much flavor to any savory dish. And roasted vidalia onions are just divine!

Psst! We are not bugging you with a pop-up to sign up for our mailing list. But it would be great if you did, just submit your email address below.

Skip to Recipe