Pressure Cooker Whole Onions with Cajun Spices | CookOS

Whole Onions

Name: Pressure Cooker Whole Onions with Cajun Spices
Prep time: 5 min
Cook time: 2 h
Total time: 2 h 5 min
Yield: 3 servings
Cuisine: American
Ingredients: 3 large yellow onions; 1 tbsp butter powder; 1 tbsp blackened seasoning; 1 tbsp seafood seasoning blend; 1 tbsp Cajun seasoning; 2 tbsp minced garlic; 1 cup water

Whole onions are pressure-cooked until tender with a bold blend of blackened, seafood, and Cajun seasonings plus garlic, creating a savory side dish and flavorful cooking broth as a bonus.

🌍American 🏷️Onion 🏷️Baked onion 🏷️Pressure cooker 🏷️Onion bomb 🏷️Side dish

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🏷️Vegetarian

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Total

2h 5m

Servings

Difficulty

Easy

Est. Cost

$16–$26

Recipe Source

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Ingredients

3 large yellow onions
1 tbsp butter powder
1 tbsp blackened seasoning
1 tbsp seafood seasoning blend
1 tbsp Cajun seasoning
2 tbsp minced garlic
1 cup water

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Instructions

1
Slice the tops off the onions.
2
Using a small knife, core out the center of each onion, going about 2-3 layers deep to create a cavity.
3
Place the cored onions inside the pot of a pressure cooker.
4
Generously season the inside and top of each onion with butter powder, blackened seasoning, seafood seasoning, and Cajun seasoning.
5
Fill the cavity of each onion with minced garlic.
6
Pour the water into the pot, around the sides of the onions, being careful not to wash off the seasoning.
7
Secure the lid on the pressure cooker and cook on high pressure for 1 hour.
8
After the cooking cycle is complete, allow the pressure to release naturally for at least 1 hour.
9
Carefully remove the tender onions with a slotted spoon and transfer them to a serving dish.
10
Serve the onions whole or sliced. The remaining liquid in the pot can be served as a flavorful onion broth.

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Tips & Notes

Pro tips

Peel onions but leave the root end intact to hold the layers together during pressure cooking.
Toast the seasonings briefly in the pot with butter powder before adding water to deepen flavor.
Release pressure naturally for 5 minutes, then quick-release remaining pressure to preserve onion texture.
Stir gently or shake the pot mid-cook to redistribute seasonings evenly around the onions.

Substitutions

Butter powder → 1 tbsp melted butter (adds richness but changes texture slightly)
Cajun seasoning → Creole seasoning (milder heat, similar depth)
Seafood seasoning blend → Old Bay seasoning (adds celery salt note)

Storage & make-ahead

Store cooked onions and broth separately in airtight containers in the refrigerator for up to 4 days. Reheat gently on the stovetop or microwave. Broth can be frozen for up to 3 months.

Equipment

pressure cooker or instant pot

Common Questions

How do I know when the onions are done?

The onions should be fork-tender after the pressure cook time. Pierce the largest onion with a knife—it should slide through easily without resistance.

Can I make this recipe without a pressure cooker?

Yes. Simmer the whole onions in a covered pot with the same water and seasonings for 45-60 minutes until very tender, adjusting liquid as needed.

What should I do with the onion broth left over?

The broth makes a flavorful base for soups, gravies, or rice dishes. Store it separately from the onions and use within 3 days, or freeze for up to 3 months.