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.
Why You'll Love Miso Butter Onions
These miso butter onions are the perfect balance of sweet, savory, and buttery goodness. Small sweet onions caramelize beautifully under a rich miso butter glaze, creating a dish that's both comforting and addictive. They elevate everything from weeknight dinners to special occasions.
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
Can I use yellow or white onions?
You can, but smaller sweet onions caramelize better and absorb the miso butter more evenly.
Can I make this ahead of time?
Yes! Reheat gently in a low oven before serving. They get even more flavorful overnight.





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