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    Gastronotherapy » Recipes » Appetizers

    Roasted Japanese Sweet Potato Fries

    Modified: Oct 4, 2023 · Published: Nov 4, 2021 · by MaryAnne · 4 Comments

    Jump to Recipe Print Recipe

    Crunchy sweet potato fries are sweet and savory, seasoned with garlic and rosemary, and served with a creamy garlic-rosemary mayo. Dip them in basil aioli for the perfect side dish or appetizer that's ready in 30 minutes!

    Roasted japanese sweet potato fries on a wooden cutting board with beer and condiments.

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    When making homemade french fries, I prefer using sweet potatoes because of their subtle sweetness, but also because of the extra nutrition and fiber they provide.

    Japanese sweet potatoes are a great variety to use when making fries, as they're a sturdier, starchier, and slightly sweeter cousin to the "regular" kind. In this recipe, they get tossed in oil, garlic, rosemary, and salt to create crispy fries that are served with a garlic-rosemary mayo.

    They make a delicious appetizer, side dish, or even main entrée when all you want for dinner is french fries and beer.

    Jump to:
    • ⭐️ Why This Recipe Is The Best
    • 🥔 Ingredient Notes
    • 📝 Variations & Substitutions
    • 🔪 How To Make This Recipe
    • 👩🏼‍🍳 Expert Tips
    • 💬 Frequently Asked Questions
    • 🍔 Related Recipes
    • Roasted Japanese Sweet Potato Fries Recipe

    ⭐️ Why This Recipe Is The Best

    • Just 5 simple and pantry-friendly ingredients
    • Crunchy, salty, and slightly sweet
    • Makes an excellent snack or side dish
    • Quick and easy - ready in 30 minutes!

    🥔 Ingredient Notes

    • Japanese sweet potatoes - These potatoes have white flesh and darker purple skin; they are denser, sweeter, and starchier than orange sweet potatoes.
    • Fresh rosemary - Adds lovely aromatics and pairs well with garlic.
    • Mayonnaise - an underrated condiment for french fries, but oh-so good.

    📝 Variations & Substitutions

    • Dried rosemary. Substitute for fresh rosemary but be sure to only use ⅓ of the amount, as it's more concentrated.
    • Orange sweet potatoes. You can use "regular" sweet potatoes for this recipe as well!
    • Garlic powder. I highly recommend using fresh garlic to get optimal flavor, but garlic powder will work, too.
    • Change up the seasoning. I love garlic-rosemary fries, but you could also toss your fries in: chili powder, paprika, cumin, or cinnamon & nutmeg (for dessert fries!)
    Sweet potato fries with garlic and rosemary and a beer bottle opener in background.

    🔪 How To Make This Recipe

    *See recipe card below for printable instructions

    Preheat oven to 425 degrees F.

    In a large bowl, toss cut sweet potatoes with oil, garlic, rosemary, and salt. Spread the potatoes in a single layer on a baking sheet.

    Cut sweet potatoes tossed in oil and spices in a mixing bowl.

    Bake for 15 minutes, until golden on the bottom. Use a spatula to flip potatoes and bake for an additional 10-15 minutes, until they are evenly crispy and browned.

    Baked sweet potato fries on a baking sheet with a napkin next to it.

    Make the Garlic-Rosemary Mayo: In a small bowl, combine mayonnaise with the rosemary, garlic, and salt.

    After removing from the oven, sprinkle with flaky sea salt. Serve with garlic-rosemary mayo.

    Hand dipping fries into ketchup with two glasses of beer in the background.

    👩🏼‍🍳 Expert Tips

    • Cut your sweet potatoes thinner so they cook faster and get nice and crispy.
    • Storage: Store in an airtight container in the refrigerator for up to 4 days.
    • How to reheat: Place in a preheated 350 degree F oven for 10-15 minutes, until heated through.
    • How to serve: Serve sweet potato fries as an appetizer or accompaniment to a hearty sandwich, like garlic grilled cheese or chicken focaccia sandwich.

    💬 Frequently Asked Questions

    What is the difference between a regular sweet potato and a Japanese sweet potato?

    Japanese sweet potatoes are a sturdier and starchier cousin to the "regular" kind. While both are very healthy, the most obvious difference is their color: Japanese sweet potatoes are purple and regular are orange on the outside.

    Why are my sweet potato fries not crispy?

    There are two important factors in making crispy fries: a hot oven and cutting potatoes thin to increase the surface area. If you do both of these (as we do in this recipe), you will have crispy fries!

    How do I bake Japanese sweet potato fries?

    In this recipe, they are tossed with oil, garlic, rosemary, and salt. They're baked in a preheated 425 degrees F. oven for around 30 minutes, until they are evenly crispy and browned, and served with a garlic-rosemary mayo.

    🍔 Related Recipes

    • Vegetarian sloppy joes arranged on a cutting board.
      What to Serve with Sloppy Joes (23 Delicious Ideas)
    • roasted red potatoes with cilantro chimichurri in a white bowl
      Roasted Chimichurri Potatoes
    • fork resting on a plate of sauteed sweet potatoes garnished with cilantro.
      Crispy Sauteed Sweet Potatoes
    • black bean corn avocado salsa in a bowl garnished with cilantro.
      Black Bean Corn Avocado Salsa

    Tried this recipe? Please leave a star ⭐️⭐️⭐️⭐️⭐️ rating below and/or a review in the comments section further down the page. You can also stay in touch with us through social media by following us on Instagram, Pinterest, TikTok, and Facebook.

    Subscribe to my email newsletter to get a FREE e-book of 15 Healthy Weeknight Recipes, and get new recipes delivered to your inbox every week!

    Roasted japanese sweet potato fries on a wooden cutting board with beer and condiments.

    Roasted Japanese Sweet Potato Fries Recipe

    Author: MaryAnne
    These crunchy sweet potato fries are sweet and savory, seasoned with garlic and rosemary, and served with a creamy garlic-rosemary mayo. The perfect side dish or appetizer that's ready in 30 minutes!
    5 from 4 votes
    Print Recipe Pin Recipe
    Prep Time 10 minutes mins
    Cook Time 25 minutes mins
    Total Time 35 minutes mins
    Course Appetizer, Side Dish
    Cuisine American
    Servings 4 servings
    Calories 251 kcal

    Equipment

    • baking sheet
    • large bowl
    • small bowl

    Ingredients
      

    • 3 medium Japanese sweet potatoes, scrubbed and cut into ½-inch thick matchsticks
    • 3 Tablespoons olive oil (or any neutral cooking oil)
    • 1 teaspoon garlic powder
    • 1 Tablespoon fresh rosemary, chopped
    • ½ teaspoon salt
    • flaky sea salt (optional)

    For the Garlic-Rosemary Mayo:

    • 2 Tablespoons mayonnaise
    • 1 teaspoon fresh rosemary, chopped
    • 1 garlic clove, minced
    • pinch of salt

    Instructions
     

    • Preheat oven to 425 degrees F.
    • In a large bowl, toss cut sweet potatoes with oil, garlic, rosemary, and salt.
    • Spread the potatoes in a single layer on a baking sheet.
    • Bake for 15 minutes, until golden on the bottom. Use a spatula to flip potatoes and bake for an additional 10-15 minutes, until they are evenly crispy and browned.
    • Make the Garlic-Rosemary Mayo: In a small bowl, combine mayonnaise with the rosemary, garlic, and salt.
    • After removing sweet potato fries from oven, sprinkle with flaky sea salt. Serve with garlic-rosemary mayo.

    Notes

    • Cut your sweet potatoes thinner so they cook faster and get nice and crispy.
    • Storage: Store in an airtight container in the refrigerator for up to 4 days.
    • How to reheat: Place in a preheated 350 degree F oven for 10-15 minutes, until heated through.

    Nutrition

    Calories: 251kcalCarbohydrates: 35gProtein: 3gFat: 16gSaturated Fat: 2gPolyunsaturated Fat: 4gMonounsaturated Fat: 9gTrans Fat: 1gCholesterol: 3mgSodium: 429mgPotassium: 590mgFiber: 5gSugar: 7gVitamin A: 24067IUVitamin C: 5mgCalcium: 60mgIron: 1mg
    Tried this recipe?Let us know how it was!

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    Reader Interactions

    Comments

    1. Sonya

      December 18, 2021 at 10:08 am

      5 stars
      I loved the sweet and savory combination of these fries! We had some leftover chipotle mayo for dipping, and it was a great pairing.

      Reply
      • Gastronotherapy

        December 18, 2021 at 2:31 pm

        That sounds delicious, Sonya! So glad you enjoyed these fries!

        Reply
    2. Erica

      April 26, 2024 at 5:13 am

      5 stars
      I loved the salty-sweetness of these fries, and the garlic and rosemary seasoning was lovely!

      Reply
      • MaryAnne

        April 26, 2024 at 6:57 am

        Thanks so much, Erica!

        Reply
    5 from 4 votes (2 ratings without comment)

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    Hi! I’m MaryAnne, the writer, recipe developer, and photographer behind Gastronotherapy, where I bring vibrant, delicious, and thoughtfully crafted mainly vegetarian and vegan (flexitarian) recipes to life. While my focus leans toward wholesome, nourishing dishes, my love for dessert ensures that indulgence always has a place at the table!

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