Miso-Scallion Roasted Sweet Potatoes Recipe

Vicky Wasik

Why It Works

  • Par-cooking the potatoes in 160°F water enhances the development of simple sugars, leading to sweeter and more flavorful roast potatoes.
  • Roasting the potatoes on aluminum baking sheets conducts more heat to them, browning and crisping them better and faster.

Savory and salty miso adds a backbone of deep flavor to these incredibly sweet roasted sweet potatoes.

Recipe Facts

Active: 20 mins
Total: 2 hrs 15 mins
Serves: 6 to 8 servings

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  • 3 pounds (1.4kg) sweet potatoes, peeled and cut into 1/2-inch chunks
  • 4 tablespoons (60ml) vegetable or canola oil, divided
  • Kosher salt and freshly ground black pepper
  • 2 tablespoons (30ml) miso (we used white miso during testing, but you can use any type)
  • 1 tablespoon (15ml) mirin
  • 1/2 tablespoon (8g) sugar
  • 2 tablespoons (30ml) water
  • 2 scallions, white and light-green parts only, thinly sliced
  • Shichimi togarashi, for garnish (optional; see note)


  1. Place sweet potatoes in a large saucepan and cover with cold water. Heat water to 160°F (70°C) as registered on an instant-read thermometer. Cover and set aside for 1 hour.

  2. Adjust oven racks to upper-middle and lower-middle positions and preheat oven to 400°F (200°C). Drain sweet potatoes and transfer to a large bowl. Toss with 3 tablespoons (45ml) oil and season to taste with salt and pepper. Spread sweet potatoes on 2 rimmed baking sheets and roast until bottom sides are browned, about 30 minutes. Carefully flip potatoes with a thin spatula and roast until second side is browned and potatoes are tender, about 20 minutes longer. Keep potatoes warm.

  3. When ready to serve, in a large mixing bowl, whisk together miso, mirin, sugar, water, and remaining 1 tablespoon (15ml) oil until smooth. Add potatoes and gently toss to coat. Fold in scallions and transfer to a serving bowl. Sprinkle with shichimi togarashi, if using, and serve.

Special equipment

Aluminum rimmed baking sheets, instant-read thermometer


Shichimi togarashi is a Japanese seven-ingredient chili powder.

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