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How to Roast Onions 

Onions are a fundamental building block in any ingredient toolkit, but with the right roasting treatment, they also make for a terrific side all on their own. For this miso-infused recipe, we took a cue from vegetable enthusiast Yotam Ottolenghi’s Flavor cookbook.

Related: How to Easily and Quickly Dice Onions

Get the recipe for roasted miso-butter onions:

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Roasted Miso-Butter Onions

  • Author: Misfits Market


  • 6 small onions, skins removed, halved
  • 5 tablespoons unsalted butter, melted
  • 4½ tablespoons white miso paste
  • 3 cups warm water
  • 3 thyme sprigs


  1. Heat oven to 500 degrees F.
  2. In a medium baking dish or a large cast-iron with high sides, whisk together melted butter and miso. Stream in warm water and whisk until well combined.
  3. Place thyme and onions, cut-side-down, in the pan, cover with foil, and roast for 30 minutes.
  4. Remove foil, gently flip each onion, baste each with the miso broth. Return to oven for another 35 to 45 minutes, basting every 15 minutes, until onions are very browned and tender.
  5. Transfer onions to a serving dish with sauce poured over top.

Hungry for more? Try one of these delicious onion-forward recipes:

One-Pot French Onion Pasta

Caramelized Onion and Apple Grilled Cheese

Caramelized Onion and Tomato Jam