Miso Butter Onions

Small sweet onions roast cut-side down in a miso butter mixture, covered first to steam, then uncovered to caramelize, finished with lemon zest and flaky salt.

Why You'll Love Miso Butter Onions

The onions roast covered for 25 minutes to steam through, then uncovered for another 20 so the miso butter caramelizes into a glaze. Lemon zest and flaky salt go on right before serving.

Tips and Tricks

• Choose small sweet onions for the best texture and natural sweetness.
• Cover the pan tightly with foil initially to steam the onions and keep them tender.
• Keep an eye during the last 20 minutes to avoid burning-ovens vary!

Variations

Experiment to make this dish your own with these tweaks.

• Swap shiro miso with yellow miso for a slightly deeper flavor.
• Add a sprinkle of toasted sesame seeds before serving for crunch.
• Mix in fresh thyme or rosemary with the miso butter for herbaceous notes.

Substitutions

If you need to switch things up, these substitutions work well.

• Use unsalted butter alternatives for a dairy-free version, like vegan margarine.
• If you don't have shiro miso, white or yellow miso are great substitutes.
• Use sweet pearl onions if small sweet onions aren't available.

Best served with

• Grilled or roasted meats
• Steamed rice or grains
• Simple green salads
• Roasted root vegetables

How to Store Leftovers

• Store leftovers in an airtight container in the fridge for up to 3 days.
• Reheat gently in a skillet or microwave to retain that buttery, caramelized goodness.

Common Questions

Miso Butter Onions

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These oven-roasted miso butter onions are the ultimate sweet-and-savory side dish. With just a handful of ingredients and minimal prep, they roast into jammy, golden perfection - finished with lemon zest and flaky salt.

Print Recipe Pin Recipe

Prep Time 5 minutes mins

Cook Time 45 minutes mins

Total Time 50 minutes mins

Servings: 6

Course: Side Dish, Vegetables

Cuisine: side

Calories: 803

Ingredients Equipment Method Nutrition Notes

Ingredients

  

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• ½ cup shiro white miso
• 8 tablespoon unsalted butter melted
• ½ cup warm water
• 4-8 small sweet onions halved
• 1 lemon zested
• Flaky salt to taste

Equipment

• Cast iron skillet or oven-safe sauté pan
• Microplane
• Aluminum foil
• Whisk

Method

 

1. Preheat oven to 500°F.
2. In a bowl, whisk together miso, melted butter, and warm water until smooth.
3. Place onions cut-side down in a medium cast iron skillet. Pour the miso butter mixture over top.
4. Cover tightly with foil and roast for 25 minutes.
5. Remove foil, flip the onions, and check if pan needs a splash more water.
6. Roast uncovered for 20 minutes more, or until deeply golden and caramelized.
7. Transfer onions to a serving dish. Garnish with lemon zest and flaky salt. Serve warm.

Nutrition

Calories: 803kcalCarbohydrates: 0.1gProtein: 1gFat: 91gSaturated Fat: 58gPolyunsaturated Fat: 3gMonounsaturated Fat: 24gTrans Fat: 4gCholesterol: 241mgSodium: 12mgPotassium: 27mgSugar: 0.1gVitamin A: 2799IUCalcium: 27mgIron: 0.02mg

Notes

Storage: These keep in an airtight container in the fridge for up to 4 days. Reheat in a hot oven or skillet so the caramelized edges come back to life; the microwave will just steam them soft. They hold up surprisingly well as leftovers.

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