Onion Boil Recipe

The “Onion Boil” recipe is a viral sensation that transforms a simple onion into a tender, buttery, and flavor-packed dish. Despite the name, it’s typically roasted or baked rather than boiled. This Southern-inspired recipe infuses onions with bold spices, butter, and seasoning blends like Cajun and Old Bay, resulting in a dish that’s perfect as a side or even a vegetarian main.

Why You’ll Love This Recipe

• Made with just a handful of pantry staples
• Bursting with bold, savory flavors
• Requires minimal prep time
• A unique twist on classic roasted vegetables
• Great as a side dish or plant-based entrée

Ingredients

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

• Large yellow or sweet onion (such as Vidalia)
• Unsalted butter
• Olive oil
• Cajun seasoning
• Old Bay seasoning
• Garlic powder
• Kosher salt
• Black pepper
• Dried parsley (optional)
• Aluminum foil (for roasting)

Directions

this recipe

1. Preheat oven to 375°F (190°C).
2. Prepare the onion: Peel the onion and cut off the top and bottom so it sits flat. Use a spoon or melon baller to hollow out a small well in the center.
3. Mix seasonings: In a bowl, combine melted butter, olive oil, Cajun seasoning, Old Bay seasoning, garlic powder, salt, pepper, and parsley if using.
4. Assemble: Place the onion on a large piece of foil. Pour the seasoning mixture into the onion’s center and over the top, allowing it to seep through the layers.
5. Wrap and bake: Wrap the onion tightly in foil and place it on a baking sheet. Bake for 45–60 minutes, until the onion is fork-tender.
6. Optional broil: Open the foil and broil the top for 5–10 minutes if you’d like a more caramelized finish.
7. Serve: Carefully unwrap the onion and spoon the seasoned butter from the foil over the top before serving.

Servings and timing

• Servings: 1–2
• Prep Time: 10 minutes
• Cook Time: 45–60 minutes
• Total Time: 55–70 minutes

Variations

• Add heat: Mix in crushed red pepper or cayenne for spicier flavor
• Cheesy top: Add grated Parmesan or cheddar during the last 10 minutes of cooking
• Vegan-friendly: Use plant-based butter instead of dairy
• Herbaceous: Try adding rosemary or thyme sprigs into the foil wrap
• Grill method: Cook the foil-wrapped onion on a grill for about 45 minutes instead of baking

Storage/Reheating

• Storage: Store leftover onion in an airtight container in the fridge for up to 3 days
• Reheating: Reheat in the oven at 350°F until warmed through or in the microwave in 30-second bursts

FAQs

What is an onion boil?

Despite the name, an “onion boil” typically refers to a roasted or foil-baked onion infused with butter and spices, not something actually boiled in water.

Can I use red onions?

Yes, red onions will work, though they’ll have a slightly sharper flavor than sweet onions.

Is this recipe spicy?

It can be mild or spicy depending on how much Cajun seasoning or pepper you use.

Can I make it in advance?

Yes, you can prep and wrap the onion ahead of time, then bake when ready to serve.

Can I cook this on the grill?

Yes, place the foil-wrapped onion on indirect heat for 45–60 minutes on the grill.

Can I use margarine instead of butter?

Yes, margarine or plant-based butter alternatives can be used.

Is this dish keto-friendly?

Yes, it’s low in carbs and fits well in a keto diet if you avoid sweet onions.

What can I serve with onion boil?

Great with grilled meats, roasted veggies, or as a unique topping for burgers and steaks.

How do I keep it from drying out?

Ensure the foil is tightly wrapped, and use enough butter and oil to keep it moist during roasting.

What if I don’t have Cajun or Old Bay seasoning?

Use any all-purpose seasoning blend or mix your own with paprika, garlic powder, onion powder, salt, and pepper.

Conclusion

The Onion Boil recipe is a simple yet bold dish that brings out the best in humble ingredients. Whether served as a savory side or enjoyed as a centerpiece, it’s easy to prepare and endlessly adaptable. Give this viral recipe a try—you might be surprised how much you love it.

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