Sweet Vidalia Onion Roast

Featured in: Everyday Family Meals

This dish features large Vidalia onions roasted whole to a meltingly soft texture. Each onion is lightly seasoned with kosher salt, black pepper, and stuffed with butter, fresh thyme, and garlic before being wrapped in foil and slowly roasted. The gentle cooking brings out the natural sweetness and tenderizes the onions, resulting in an elegant side. Optionally, fresh parsley adds a touch of freshness once unwrapped. This preparation pairs well with grilled vegetables or roasted meats, offering a simple yet refined flavor profile.

Updated on Tue, 18 Nov 2025 09:49:00 GMT
Golden, caramelized whole onion boil glistening with melted butter, herbs, ready to serve. Save to Pinterest
Golden, caramelized whole onion boil glistening with melted butter, herbs, ready to serve. | recipesbies.com

A sweet, tender Vidalia onion roasted whole until meltingly soft, with aromatic herbs and butter: a simple yet elegant side dish.

I first made Onion Boil when searching for easy crowd-pleasers for my family holiday table: its humble ingredients always earn rave reviews!

Ingredients

  • Vidalia onions: 4 large, unpeeled (or substitute sweet onions)
  • Unsalted butter: 4 tbsp
  • Fresh thyme: 4 sprigs
  • Garlic: 4 cloves, peeled
  • Kosher salt: 1 tsp
  • Freshly ground black pepper: ½ tsp
  • Chopped fresh parsley: 2 tbsp, optional garnish

Instructions

Prep & Preheat:
Preheat oven to 400°F (200°C).
Trim Onions:
Trim root ends and tops so onions sit flat, leave skins on.
Score Tops:
Use paring knife to cut shallow X into onion tops.
Season:
Place onions on heavy-duty foil squares, sprinkle with salt and pepper.
Add Aromatics:
Press 1 tbsp butter, 1 sprig thyme, and 1 garlic clove into each onion top.
Wrap & Roast:
Wrap each onion tightly in foil, set on baking sheet, roast for 1 hour 10 minutes until very tender.
Finish & Serve:
Unwrap, remove skins, place on plates. Spoon over melted butter from foil. Sprinkle with parsley.
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| recipesbies.com

My kids always love unwrapping their own onion parcels at the table: a little surprise moment that makes this dish special for gatherings.

Required Tools

Baking sheet, heavy-duty aluminum foil, paring knife, oven

Allergen Information

Contains dairy (butter): substitute with vegan butter or olive oil for dairy-free; always check ingredient labels.

Nutritional Information

Per serving: 130 Calories, 7 g Total Fat, 19 g Carbohydrates, 2 g Protein

Deliciously tender onion boil, infused with thyme and garlic, is a perfect, savory side. Save to Pinterest
Deliciously tender onion boil, infused with thyme and garlic, is a perfect, savory side. | recipesbies.com

Enjoy these sweet onions hot from the oven: their simple flavor makes any meal feel special.

Answers to Recipe Questions

What type of onions work best for roasting?

Sweet varieties like Vidalia, Walla Walla, or Maui onions are ideal due to their natural sugars and tender texture after roasting.

How do I know when the onions are fully cooked?

They should be very tender and easily pierced with a knife, indicating a soft, melting texture.

Can I add extra flavors to the onions before roasting?

Yes, ingredients like balsamic vinegar or smoked paprika can be added for additional depth and complexity.

Is it necessary to keep the onion skins on during roasting?

Keeping skins on helps protect the onions, allowing them to steam gently and retain moisture, resulting in a tender interior.

What are good serving suggestions for roasted Vidalia onions?

They pair beautifully with grilled vegetables, roast meats, or as a hearty vegetarian component alongside crusty bread.

Sweet Vidalia Onion Roast

Slow-roasted Vidalia onions with herbs and butter, tender and full of natural sweetness.

Prep duration
10 mins
Time to cook
70 mins
Overall time
80 mins
Published by Sophie Turner


Skill Level Easy

Cuisine Type American

Serves 4 Serving size

Dietary Details No meat included, Contains No Gluten

What you need

Main

01 4 large Vidalia onions, unpeeled

Seasoning & Aromatics

01 4 tablespoons unsalted butter
02 4 sprigs fresh thyme
03 4 garlic cloves, peeled
04 1 teaspoon kosher salt
05 0.5 teaspoon freshly ground black pepper

Optional Garnish

01 2 tablespoons chopped fresh parsley

How to Make It

Step 01

Preheat oven: Set oven temperature to 400°F.

Step 02

Prepare onions: Trim root ends and tops of each onion to create a flat base while leaving the skins intact.

Step 03

Score onions: Use a paring knife to carve a shallow X into the top of each onion.

Step 04

Season onions: Place each onion on a foil square, then sprinkle evenly with kosher salt and black pepper.

Step 05

Add butter and aromatics: Press 1 tablespoon butter, 1 sprig thyme, and 1 garlic clove into the scored top of each onion.

Step 06

Wrap onions: Securely wrap each onion in heavy-duty foil and position them on a baking sheet.

Step 07

Roast onions: Bake for 1 hour and 10 minutes until onions become tender when pierced.

Step 08

Serve: Carefully unwrap onions, peel away skins, transfer to plates, spoon reserved melted butter over, and garnish with parsley if desired.

Equipment You'll Need

  • Baking sheet
  • Heavy-duty aluminum foil
  • Paring knife
  • Oven

Allergy Details

Review all ingredients for allergens, and reach out to a healthcare pro if unsure.
  • Contains dairy. Use vegan butter or olive oil for dairy-free option.

Nutrition info (by portion)

Nutrition info is for guidance. Please consult a medical expert if you need advice.
  • Total Calories: 130
  • Fat content: 7 g
  • Carbohydrate: 19 g
  • Protein content: 2 g