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fondant japanese sweet potatoes on a blue serving plate

Fondant Japanese Sweet Potatoes

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5 from 1 review

  • Author: Lisa Kitahara
  • Total Time: 1 hour 5 minutes
  • Yield: 2-3 servings 1x
  • Diet: Vegetarian


These Japanese Fondant Potatoes are crispy on the outside, melt-in-your-mouth buttery soft inside, and sauced in a sweet and savory miso maple brown butter sauce. 


Units Scale
  • 2 lbs Japanese sweet potatoes (2 large or 3-4 medium)
  • 2 tbsp vegetable or canola oil
  • 3 tbsp butter
  • 2 garlic cloves, halved
  • salt
  • pepper
  • 3/4 cup vegetable stock
  • 1 batch of maple miso brown butter sauce
  • sesame seeds for garnish, optional


  1. Pre-heat oven to 425 F (220 C) convection or 400 F (200 C) fan forced.
  2. Peel the potatoes and slice the ends off. Slice enough of the ends off so you have a good amount of surface area to ensure even cooking. Cut the potatoes into 1 1/2 inch thickness. Soak in cold water for 10 minutes to remove excess starch.
  3. Heat the oil in a cast iron skillet or oven safe pan over to high heat. Pat the potatoes dry and then place the potatoes in the pan and cook for 5 minutes, or until golden brown. Move them around a bit half way to ensure they don’t stick to the pan. Season with sprinkle of salt and pepper. 
  4. Flip the potatoes and cook for another 5 minutes. 
  5. Use paper towels to blot excess oil out of the skillet. 
  6. Add the butter and garlic to the pan between the potatoes. Let the butter melt and fizzle a bit to let the garlic flavour infuse. Baste all the potatoes with the butter.
  7. Remove garlic and pour in vegetable stock. Season the potatoes with salt and pepper. 
  8. Place into the oven and cook for 40 minutes or until tender. If at any point the pan looks dry, add a bit more hot stock, enough to coat the pan. 
  9. Remove from oven. Place on a serving dish and drizzle with the miso maple brown butter sauce. Add sesame for garnish if desired. Enjoy!!
  • Prep Time: 5 minutes
  • Cook Time: 60 minutes
  • Category: Side dish
  • Method: Fondant
  • Cuisine: French