Onion boil
Onion boil is a medium American (Cajun) recipe that serves 4. 300 calories per serving. Recipe by Cooking With Brooke's Kitchen on YouTube.
Prep: 20 min | Cook: 1 hr 5 min | Total: 1 hr 40 min
Cost: $4.30 total, $1.07 per serving
Ingredients
- 4 large Red Onion (peeled, tops trimmed, center carved out to create a well)
- 2 tablespoons Olive Oil (for coating the onions so the rub adheres)
- 8 tablespoons Unsalted Butter (cut into large chunks; 2 tbsp per onion for stuffing, plus extra for sauce)
- 1 teaspoon Smoked Paprika (adds smoky depth)
- 1 teaspoon Dried Oregano
- 1/4 teaspoon Cayenne Pepper (adjust to heat preference)
- 1/2 teaspoon Black Pepper (freshly ground if possible)
- 1/2 teaspoon Ground Thyme
- 1 teaspoon Onion Powder
- 1 teaspoon Garlic Powder
Instructions
Prepare the Cajun Rub
In a mixing bowl combine smoked paprika, dried oregano, cayenne pepper, black pepper, ground thyme, onion powder, and garlic powder. Stir until evenly mixed.
Time: PT5M
Prep the Onions
Place the red onions on a cutting board. Trim the tops, peel, and carve out a shallow well in the center of each onion using the tip of the knife, being careful not to cut through the outer layers.
Time: PT7M
Season the Onions
Drizzle each onion with olive oil, then roll them in the prepared Cajun rub, ensuring the seasoning sticks to the surface.
Time: PT5M
Stuff with Butter
Place a generous chunk (about 2 tablespoons) of unsalted butter into the well of each onion. The butter will melt and baste the onion as it roasts.
Time: PT3M
Wrap for Roasting
Arrange the onions on a baking sheet, then tightly wrap each onion individually in aluminum foil to trap steam.
Time: PT2M
Roast the Onions
Place the foil‑wrapped onions in a pre‑heated oven at 400°F and roast for 60 minutes, or until the onions are very tender when pierced with a fork.
Time: PT1H
Temperature: 400°F
Make the Butter Sauce
While the onions finish roasting, melt the remaining 2 tablespoons of butter in a small saucepan over low heat. Stir until fully melted and slightly browned for extra flavor.
Time: PT5M
Finish and Serve
Remove the onions from the oven, carefully open the foil (steam will be hot). Transfer the onions to a serving bowl, pour the melted butter sauce over the tops, and serve immediately while hot.
Time: PT3M
Nutrition Facts
- Calories
- 300
- Protein
- 2g
- Carbohydrates
- 15g
- Fat
- 28g
- Fiber
- 3g
Dietary info: Vegetarian, Gluten-Free
Allergens: Dairy (butter)
Last updated: March 24, 2026








