Whole Roasted Onions Recipe (2024)

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By Courtney ODell

4.47 from 15 votes

Apr 28, 2022, Updated Mar 23, 2024

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Whole Roasted Onions Recipe – delicious buttery whole roasted onions baked to perfection – perfect as a side dish!

Whole Roasted Onions Recipe (2)

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Table of contents

  • Buttery Whole Onions
  • How To Roast Whole Onions
  • Tips and Tricks to Perfect Whole Roasted Onions
  • Recipe FAQs
  • Other Easy Side Dishes You’ll Love
  • Whole Roasted Onions Recipe
Whole Roasted Onions Recipe (3)

Buttery Whole Onions

This is the perfect gorgeous – but crazy easy – side dish for a holiday dinner or even Sunday supper – and it makes the whole house smell amazing.

These onions roast to soft, buttery perfection with just a couple herbs and spices – and are fabulous paired with pork tenderloin, steaks, turkey, chicken thighs, or any hearty main dish you love!

We hope you love this recipe as much as we do!

How To Roast Whole Onions

Roasting onions is so easy, you’re going to want to make these decadent, buttery onions for every meal!

If you can use a knife and sprinkle some herbs, you can make this side dish!

The process is relatively straightforward, following these steps:

  • Cut off the top and bottoms to onions
  • Season generously with salt and pepper
  • Top with butter and herbs
  • Bake

Tips and Tricks to Perfect Whole Roasted Onions

Baked onions are done when they are browned and very soft, which can take anywhere from 60-100 minutes.

Don’t rush your onions – make them ahead of time and reheat if you’re worried about timing for an event, as the flavor really can’t be rushed for this recipe.

Recipe FAQs

When are whole roasted onions done?

Baked onions are done when they are browned and very soft, which can take anywhere from 60-100 minutes.
Don’t rush your onions – make them ahead of time and reheat if you’re worried about timing for an event, as the flavor really can’t be rushed for this recipe.

Do you roast onion in the skin?

We roast onion in the skin for the best flavor – simply discard when serving.

Are whole roasted onions vegan?

This recipe isn’t expressly vegan, as we’re using butter.
Swap the butter for equal amounts of olive oil drizzled over the onions to make it vegan!

How long can whole roasted onions be kept?

This recipe can be stored in the refrigerator in an airtight container for up to five days.

Whole Roasted Onions Recipe (7)

Other Easy Side Dishes You’ll Love

If you’re looking for other dishes to pair alongside a pork tenderloin, London broil, turkey breast, lobster tails, or even cauliflower steaks – please check out some of our favorite side dishes below:

You can find our entire side dish recipe index here.

Whole Roasted Onions Recipe (8)

Whole Roasted Onions Recipe

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Whole Roasted Onions Recipe (10)

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Whole Roasted Onions Recipe

Whole Roasted Onions Recipe – delicious buttery whole roasted onions baked to perfection – perfect as a side dish for pork, chicken, & steak!

Course Side dishes

Cuisine American

Keyword onions, side dish, vegetables

Prep Time 5 minutes minutes

Cook Time 1 hour hour 10 minutes minutes

Total Time 1 hour hour 15 minutes minutes

Servings 6

Calories 151kcal

Author Courtney O’Dell

Ingredients

  • 6 yellow onions
  • 6 tablespoons butter cut into 6 pats for each onion (use olive oil for vegan)
  • 1 tsp italian herb seasonings
  • 2-3 sprigs fresh rosemary or thyme
  • salt and pepper to taste

Instructions

  • Preheat oven to 350 degrees.

  • Cut the top and bottom off onion to make a flat surface, leaving peel on.

  • Place into baking dish, either lined with foil or prepped with nonstick cooking spray.

  • Sprinkle with salt, pepper, and herbs.

  • Top with a pat of butter.

  • Bake 60-90 minutes at 350 degrees, until onions are browned, very soft, and fragrant.

  • When serving, remove peel.

Nutrition

Serving: 1g | Calories: 151kcal | Carbohydrates: 11g | Protein: 2g | Fat: 12g | Saturated Fat: 7g | Polyunsaturated Fat: 4g | Cholesterol: 31mg | Sodium: 144mg | Fiber: 2g | Sugar: 5g

Categorized as:
gluten free, One Pot, Recipes, Side Dishes, Vegetables

About Courtney

Courtney loves to share great wine, good food, and loves to explore far flung places- all while masting an everyday elegant and easy style at lifestyle blog Sweet C’s Designs. Sweet C's devoted to finding the best food and drinks you'll want to make or find, around the world!

Read More About Me

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Whole Roasted Onions Recipe (2024)

FAQs

What kind of onion is best for roasting? ›

We recommend using yellow or red, because they hold up well during the roast. How do you cut an onion for roasting? We trim and peel the onions, and cut them into wedges for this preparation.

Are roasted onions good for you? ›

Onions offer many benefits for your health, including reducing risk for cancer and heart disease. They also have fiber which can help with digestion. This is a great way to use any extra onions you may have.

How long do you need to cook onions? ›

Cook until caramelized. Keep cooking the onions, stiring frequently, until they are brown all over and completely limp. Caramelized onions take some time — anywhere from 20 minutes to 45 minutes total cooking time depending on how deeply caramelized you like your onions.

What is the best onion to eat whole? ›

While their color is similar to the yellow onion, white onions have a thinner, more-papery skin. They are also known for their consistently milder flavor, making them a better choice for serving raw.

Which onion has the most flavor when cooked? ›

White onions are probably the strongest-tasting onion on this list. They're typically used in Asian and Mexican dishes, as well as potato and macaroni salads. You can also sauté them, making them ideal for French onion soup or any other food in which you want to add sweet or sour flavor.

How to roast onion without oil? ›

Add a little water to the pan — start with 3 Tbsp (as original recipe is written). Add sliced onions and stir. Then cover. Cook for a total of 30-40 minutes, opening the lid and stirring every 5 minutes.

What color onion goes in roast? ›

Though you can use white onions, sweet onions, or red onions, we recommend using yellow ones because of their unique flavor profile. Yellow onions are a widely used onion type in the US and is great with meat dishes such as pot roast, roasted chicken, lamb rack, stew, and more.

Which organ benefits most from eating onions? ›

The antioxidants and anti-inflammatory properties onions contain make consuming onions great for your heart health. Not only that, but they are also highly nutritious and delicious! Read on to discover these ten health benefits of onions and how they can make a delicious difference in any meal.

What does eating a whole onion do to your body? ›

Onions are rich in antioxidants like quercetin, which assist in decreasing bad cholesterol levels in the body, leading to improved cardiovascular health. Consumption of raw onion also aids in enhancing blood circulation, reducing high blood pressure, and preventing the risk of heart disease.

Why don't I eat onions at night? ›

Onions. Eating onions before going to bed can cause acid reflux. The gas created as onions move through your system can place pressure inside of your stomach and force acid into your esophagus. This effect is seen with both grilled and raw onions and is especially likely to occur when you are in a prone position.

What temperature should onions be cooked at? ›

Around 320°F, sliced onions will caramelize without burning, and don't require constant stirring. 4 ways of cooking onion on Cinder Grill - the third image shows caramelized onions cooked at 310°F for 25 minutes.

What temperature do you caramelize onions in the oven? ›

It also frees up my hands (and my stove) for other tasks, like simmering pasta or rice, which makes multitasking possible. Hands, as usual, are the best tool for even tossing. To caramelize onions in the oven, heat the oven to 400° and line a rimmed baking sheet with parchment paper.

Do you cook onions covered or uncovered? ›

The first phase of the process is softening the onions so that they collapse into a tender mass while releasing a good deal of their liquid. If you cover the pan, you'll trap steam, which will speed up their softening, heat them more quickly, and help release their liquid more quickly.

Is red or white onion better for roasting? ›

The general rule usually, is that the red onion is eaten raw, the white one is used to flavor a dish, while the yellow one is ideal for slow cooking.

Is yellow or white onion better for roasting? ›

One of the best things yellow onions are used for is caramelization, which will increase the flavor of your pot roast even more. This is because of their high natural sugar content, which is what allows them to turn sweet as they are heated, achieving that characteristic caramelized consistency and taste.

What are the best onions for cooking meat? ›

Yellow onions are the most popular cooking onions because they add excellent flavor to most stews, soups, and meat dishes. In fact, typically when a cooked recipe calls for onion, yellow onion is a safe way to go. Yellow onions have a yellow-brown papery skin on the outside and a white flesh.

Is white onion good for roasting? ›

Here's an overview of what you'll need: Medium onions: White or yellow onions work well in this recipe (here's the difference between different onion types), although I usually tend to use yellow ones.

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