Sweet Vidalia Onion Roast

Featured in: New England Classics

This dish features whole Vidalia onions roasted until meltingly soft, infused with butter, fresh thyme, and garlic. The onions are wrapped in foil and slow-cooked until tender, resulting in a sweet and aromatic side. Removing the skins reveals the delicate texture and rich flavors, enhanced by a finishing sprinkle of parsley. Ideal alongside meats or grilled vegetables, this preparation highlights the onion’s natural sweetness.

Updated on Mon, 17 Nov 2025 16:41:00 GMT
Roasted whole onion boil, tender and sweet, bubbling with butter and herbs, a perfect side. Save It
Roasted whole onion boil, tender and sweet, bubbling with butter and herbs, a perfect side. | zetluna.com

A sweet, tender Vidalia onion roasted whole until meltingly soft, with aromatic herbs and butter. It's a simple yet elegant side dish suitable for any occasion.

I first made Onion Boil for a family gathering, and everyone loved how the onions became almost creamy inside while the herbs infused incredible taste. It's now a staple side for our holiday dinners.

Ingredients

  • Vidalia onions: 4 large, unpeeled (or other sweet onions)
  • Unsalted butter: 4 tbsp
  • Fresh thyme: 4 sprigs
  • Garlic: 4 cloves, peeled
  • Kosher salt: 1 tsp
  • Black pepper: ½ tsp, freshly ground
  • Fresh parsley: 2 tbsp, chopped (optional garnish)

Instructions

Preheat oven:
Set oven to 400°F (200°C).
Prepare onions:
Trim root ends and tops so onions sit flat. Keep skins on. Cut a shallow X in the top of each onion.
Season:
Place onions on foil squares. Sprinkle each with salt and pepper.
Add aromatics:
Press 1 tbsp butter, 1 sprig thyme, and 1 garlic clove into the top of each onion.
Wrap and roast:
Wrap onions tightly in foil; set on a baking sheet. Roast for 1 hour 10 minutes until very tender.
Finish and serve:
Carefully unwrap, remove skins, and transfer onions to plates. Spoon over the melted butter from foil. Sprinkle parsley if desired.
Golden brown onion boil, with visible thyme sprigs, resting on a plate, ready to serve. Save It
Golden brown onion boil, with visible thyme sprigs, resting on a plate, ready to serve. | zetluna.com

My grandmother always sat beside me in the kitchen when we made these, sharing stories while the onions roasted slowly and filled the house with a wonderful aroma.

Serving Suggestions

Serve Onion Boil alongside roast meats, grilled vegetables, or as a vegetarian main with crusty bread. Its flavor and texture pair well with a variety of entrees.

Variations

Try adding a splash of balsamic vinegar or a pinch of smoked paprika before roasting for extra flavor. Swap Vidalia onions for Walla Walla or Maui if available.

Nutrition

Each serving contains approximately 130 calories, 7 g fat, 19 g carbohydrates, and 2 g protein. Always check ingredient labels for hidden allergens.

Meltingly soft onion boil, seasoned with garlic, glistening after roasting, aromatic side dish. Save It
Meltingly soft onion boil, seasoned with garlic, glistening after roasting, aromatic side dish. | zetluna.com

Add Onion Boil to your next meal for an easy yet impressive side. It's a dish that makes ordinary onions truly shine.

Common Questions About Recipes

What type of onions work best?

Sweet onions like Vidalia, Walla Walla, or Maui are ideal for their natural sweetness and tenderness when roasted.

Can I prepare this without butter?

Yes, you can substitute butter with vegan butter or olive oil to accommodate dietary preferences.

How do I know when the onions are done?

They should be very tender when pierced with a knife, and the interior should easily melt.

What herbs complement the dish?

Fresh thyme adds an aromatic touch, while parsley sprinkled at the end brightens the flavors.

Can I add additional seasonings?

Yes, a splash of balsamic vinegar or a pinch of smoked paprika can enhance the flavor profile.

Sweet Vidalia Onion Roast

Slow-roasted Vidalia onions infused with butter and fresh herbs for a tender side.

Prep Time
10 mins
Time to Cook
70 mins
Overall Time
80 mins
Authored by Clara

Recipe Type New England Classics

Skill Level Required Easy

Cuisine Type American

Recipe Output 4 Number of Portions

Dietary Needs Veggie-Friendly, Free of Gluten

The Ingredients You'll Need

Main

01 4 large Vidalia onions, unpeeled

Seasoning & Aromatics

01 4 tablespoons unsalted butter
02 4 sprigs fresh thyme
03 4 cloves garlic, peeled
04 1 teaspoon kosher salt
05 ½ teaspoon freshly ground black pepper

Optional Garnish

01 2 tablespoons chopped fresh parsley

Step-by-Step Instructions

Step 01

Preheat oven: Set the oven temperature to 400°F.

Step 02

Prepare onions: Trim just the root ends and tops of each onion so they sit flat, keeping the skins intact.

Step 03

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

Step 04

Season onions: Place each onion on a square of heavy-duty foil. Sprinkle with salt and pepper.

Step 05

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

Step 06

Wrap onions: Wrap each onion tightly in the foil and place on a baking sheet.

Step 07

Roast onions: Bake in the preheated oven for 1 hour 10 minutes, until very tender when pierced.

Step 08

Serve: Carefully unwrap the onions, remove skins, and transfer to serving plates. Spoon over any melted butter and sprinkle with parsley if desired.

Tools You'll Need

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

Allergy Information

Review each ingredient to identify allergens and consult an expert if needed.
  • Contains dairy (butter). For dairy-free options, substitute with vegan butter or olive oil.

Nutritional Facts (Per Serving)

Keep in mind these details are for general guidance and shouldn't replace professional advice.
  • Caloric Content: 130
  • Fats: 7 grams
  • Carbohydrates: 19 grams
  • Proteins: 2 grams