These Japanese sweet potato fries are crispy on the outside, soft in the center, and totally addictive.
This easy purple sweet potato recipe is quick to make in the air fryer. It delivers sweet, golden flavor. No deep frying needed.
Jump to:
- How I Got Hooked on Air Fryer Sweet Potatoes
- What Are Japanese Sweet Potatoes?
- Why You'll Love This Recipe
- Recipe at a Glance
- Essential Ingredients
- Essential Kitchen Tools
- How to Cook Air Fryer Japanese Sweet Potato Fries
- Tips for Perfect Air Fryer Fries
- How to Serve & Pair Japanese Sweet Potato Fries
- What to Serve with Japanese Sweet Potato Fries (Best Pairings!)
- Storage & Reheating Tips
- Frequently Asked Questions
- Try My Other Japanese Side Dishes and Snacks
- Japanese Purple Sweet Potato Fries (Air Fryer Recipe)
How I Got Hooked on Air Fryer Sweet Potatoes
I used murasaki imo for their bold purple color. But regular satsumaimo are sweeter, easier to find, and work just as well.
This recipe was inspired by a summer visit to the U.S. My sister made sweet potato fries in our parents' air fryer. From the first bite, I was hooked—crispy edges, soft caramelized center, everything I love in a fry.
Back in Japan, I knew air fryers weren’t as common. Japanese home cooking is already healthy. And with limited kitchen space, buying another kitchen toy felt unnecessary.
But I gave in and bought a compact model just to make these fries. I’ve never looked back. They’re crunchy, naturally sweet, and incredibly easy to make. Now I make them all the time.
Today, I’m sharing my go-to recipe so you can enjoy it too.
What Are Japanese Sweet Potatoes?
Japanese sweet potatoes, known as satsumaimo (さつまいも), have a reddish-purple skin and a pale yellow or cream-colored interior that turns golden when cooked. They are naturally sweet, fluffy, and starchier than the orange sweet potatoes commonly found in the West, making them perfect for air-frying.
Another variety, murasaki imo (紫芋), has a striking deep purple flesh with a slightly firmer, drier texture. While satsumaimo is naturally sweeter, murasaki imo has an earthier taste and a stunning color that makes for an eye-catching dish. Both varieties work well for this recipe, but if you prefer a softer texture and a touch of caramelized sweetness, satsumaimo is the better choice.
In Japan, sweet potatoes are often enjoyed as yaki-imo (焼き芋)—roasted whole and eaten as a simple, warming snack. Their unique texture and flavor make them a versatile ingredient in both sweet and savory dishes.
Craving something creamy instead of crispy? Try my Mashed Purple Japanese Sweet Potatoes for a bold twist on your favorite spud.
Where to Buy Japanese Sweet Potatoes
In Japan
Japanese sweet potatoes are widely available at supermarkets, farmers’ markets, and specialty stores, especially during their peak season in fall and winter.
Seasonal Availability
- Murasaki imo (purple sweet potatoes) are typically harvested in the fall (September–November). They are available throughout the winter after curing, which enhances their natural sweetness.
- Satsumaimo varieties have a longer growing season, making them easier to find year-round.
Where to Buy Japanese Sweet Potatoes Outside Japan
If you’re looking for Japanese sweet potatoes outside Japan, you can find them at the following locations:
Japanese & Asian Grocery Stores
- Nijiya Market (U.S.)
- Mitsuwa Marketplace (U.S.)
- H Mart (International, Korean-focused but often stocks Japanese ingredients)
- Other Asian Supermarkets – Many carry Japanese sweet potatoes in the produce section.
Mainstream Grocery Stores
- Trader Joe’s – A seasonal item, usually stocked in the fall.
- Whole Foods & Organic Markets – Occasionally available in the produce section.
- Local Supermarkets – Some stores, especially those with diverse produce sections, stock them under names like "Japanese yams."
Farmers’ Markets & Local Co-ops
- Some small farms grow Japanese sweet potatoes, depending on the region and climate. If you're looking for local sources, check with vendors at farmers' markets.
Online Retailers
- Amazon – Some sellers offer fresh Japanese sweet potatoes for direct shipment.
- Specialty Asian Grocers – Online retailers specializing in Japanese ingredients.
- Farm-to-Table Services – Some companies source directly from farms and deliver fresh produce to your doorstep.
Why You'll Love This Recipe
✔️ Crispy outside, soft inside – The perfect balance of texture in every bite.
✔️ Healthier than deep-fried fries – Uses just a touch of oil for a lighter alternative.
✔️ Naturally sweet & flavorful – No added sugar needed.
✔️ Packed with nutrients – Rich in fiber, antioxidants, and vitamin C to support overall health.
✔️ Easy & fuss-free – Minimal prep, simple ingredients, and effortless clean-up.
Recipe at a Glance
🥢 Cuisine: Japanese, Western
🍽️ Course: Side Dish, Snack
🌱 Dietary Info: Vegetarian, Gluten-free
🔪 Skill Level: Beginner
Whether you’re craving a healthy snack or a delicious side dish, Japanese sweet potatoes are a must-try ingredient. Have you found them in your area? Let us know in the comments!
Essential Ingredients
- Japanese Sweet Potato (Satsumaimo / Murasaki Imo) – Naturally sweet with a starchy texture, ideal for crisping. Look for Satsumaimo (さつまいも) or Beni Haruka (紅はるか) for the best flavor.
- Substitutes: Stokes purple or regular sweet potatoes (texture and sweetness will vary).
- Olive Oil (or Avocado Oil, Sesame Oil for a Japanese twist)
- Salt & Fresh Ground Black Pepper – Use fine sea salt for even seasoning or flaky salt for added crunch.
Optional Seasonings (Customize Your Fries!)
- Soft, warm butter with honey (for dipping)
- Matcha salt
- Yuzu salt
- Kuromitsu drizzle
- Cinnamon & maple syrup for a sweet version
Essential Kitchen Tools
- Air fryer – Any brand works, but larger baskets help prevent overcrowding. (I love using my new COSORI air fryer!)
- Sharp knife – Ensures even cuts.
- Tongs or long cooking chopsticks – For easy flipping.
- Bowl or pan – To coat the sweet potato sticks evenly.
How to Cut Japanese Sweet Potato Fries
- Choose the Right Size – Medium-sized sweet potatoes work best. If using long and skinny varieties, you may need to shorten your fries to fit inside your air fryer.
- Peel (Optional) – Peel for a smoother texture, but the skin is edible and adds nutrients. Organic sweet potatoes are best if leaving the skin on.
- Remove Ends – Trim both ends for a uniform shape.
- Cut in Half Lengthwise – Slice the potato in half for easier handling.
- Slice into Planks – Cut into ½-inch thick planks for even cooking.
- Cut into Fries – Slice each plank into uniform fries, about ½-inch thick. Thicker fries will be softer inside, while thinner ones will be crispier.
How to Cook Air Fryer Japanese Sweet Potato Fries
- Preheat the Air Fryer – Set to 375°F (190°C) for a few minutes to ensure proper cooking temperature.
- Season the Fries – Toss with olive oil, salt, pepper, and any optional seasonings.
- Arrange in a Single Layer – Avoid overcrowding to prevent steaming instead of crisping.
- Air Fry – Cook for 10–11 minutes, shaking the basket or flipping halfway through for even browning. Cook time may vary slightly depending on your air fryer– so be sure to watch your first batch to prevent burning!
- Serve Immediately – Enjoy hot and crispy with your favorite dipping sauce or as is.
Tips for Perfect Air Fryer Fries
✔️ Cut Evenly – Ensures all fries cook at the same rate.
✔️ Preheat the Air Fryer – Helps develop a golden, crispy crust while keeping the inside soft.
✔️ Don’t Overcrowd – Work in batches if needed to prevent steaming.
✔️ Flip Halfway Through – Shake the basket or use tongs for even browning.
✔️ No Need to Soak – Unlike regular sweet potatoes, Japanese sweet potatoes crisp up well without soaking.
How to Serve & Pair Japanese Sweet Potato Fries
- Classic: Sprinkle with sea salt and enjoy as a snack or side dish.
- Savory: Pair with matcha salt, yuzu mayo, or miso butter.
- Sweet: Dust with cinnamon and drizzle with honey for a dessert-like treat.
- Japanese-Style Sweet: Dust with kinako (roasted soybean powder) mixed with sugar and drizzle with kuromitsu (black sugar syrup).
What to Serve with Japanese Sweet Potato Fries (Best Pairings!)
Pair your crispy Japanese sweet potato fries with these delicious Japanese-inspired dishes and drinks:
For a balanced meal, pair your crispy sweet potato fries with a protein like yakitori or grilled fish (such as salmon shioyaki), along with Japanese pickles and a fresh green salad.
Storage & Reheating Tips
How to Store Leftovers
- Cool completely before storing to prevent sogginess.
- Transfer to an airtight container and refrigerate for up to 3–4 days.
- For best texture, avoid stacking too many fries—place parchment paper between layers if needed.
Best Way to Reheat
Air Fryer (Best for Crispiness)
- Preheat to 360°F (182°C).
- Arrange fries in a single layer and air-fry for 1–2 minutes until heated through and crispy.
Oven/Toaster Oven (Good Alternative)
- Preheat to 375°F (190°C).
- Spread fries on a baking sheet and heat for 5–7 minutes, flipping halfway.
Pro Tip: If fries feel dry, spritz lightly with oil before reheating for extra crispiness!
Frequently Asked Questions
Japanese purple sweet potatoes, known as murasaki imo (紫芋), are prized for their vibrant purple flesh and mildly sweet, earthy flavor with subtle floral notes. Their firm, dense texture makes them ideal for roasting, baking, or air frying. The deep purple color comes from natural pigments called anthocyanins.
Not exactly.
Japanese sweet potatoes include several varieties of satsumaimo, which typically have yellow or white flesh. Murasaki imo (紫芋) is a specific variety known for its deep purple flesh and mildly sweet, earthy flavor.
The term “purple potato” is more general and can refer to various types of potatoes with purple skin or flesh grown around the world. These are not necessarily sweet potatoes.
Note: Purple yams, or ube, popular in the Philippines, are different from Japanese purple sweet potatoes. Ube is usually starchier and less sweet, while murasaki imo has a smoother, creamier texture and mild natural sweetness.
Japanese purple sweet potatoes, or murasaki imo (紫芋), contain dietary fiber, vitamin C, and vitamin B6. Their vibrant purple color comes from anthocyanins—natural pigments and phytonutrients found in many red and purple fruits and vegetables. These compounds contribute to their distinctive color and flavor.
Source (Japanese): MEXT 食品成分データベース – むらさきいも
They’re delicious baked, roasted, or air-fried until tender and naturally sweet. The skin crisps up nicely and is edible, adding texture and nutrients. You can enjoy them plain or topped with savory flavors like miso butter or sweet options like honey and cinnamon. They’re also popular in desserts and creative purple sweet potato recipes.
Cook at 375°F (190°C) for about 10–11 minutes, depending on thickness. No soaking or boiling is necessary before cooking.
Try My Other Japanese Side Dishes and Snacks
Did you try this Japanese sweet potato air fryer recipe? 🍠✨ I’d love to see your crispy creations!
Tag @eyesandhour 📸 on Instagram. Drop a ⭐️⭐️⭐️⭐️⭐️ rating & comment below—your feedback helps others discover this recipe!
Japanese Purple Sweet Potato Fries (Air Fryer Recipe)
Ingredients
- 1 Japanese sweet potato medium size
- 1 tablespoon extra virgin olive oil
- ¾ teaspoon sea salt
- ⅛ teaspoon fresh ground pepper
Instructions
Preheat the Air Fryer
- Set to 380°F (190°C) and let it preheat for a few minutes.
Prepare the Sweet Potatoes
- Peel (optional) – The skin is edible and adds nutrients.
- Cut into ½-inch thick fries for even cooking.
- In a large bowl or pan, toss the fries with olive oil, salt, and black pepper until evenly coated.
Air-Fry the Sweet Potato Fries
- Cook in batches – Arrange fries in a single layer in the air fryer basket, ensuring they aren’t overcrowded.
- Air fry at 380°F (190°C) for 11–12 minutes, shaking the basket or flipping the fries halfway through.
- Check for doneness – Fries should be golden and crispy on the outside, soft on the inside. If needed, air fry for 1–2 more minutes.
- Enjoy hot with your favorite dipping sauce or toppings!
Dipping Sauce: Honey Butter Drizzle
- Warm 2 tablespoon butter in a microwave (5–10 sec) or room temp until soft.
- Drizzle 1 teaspoon honey over the softened butter.
- Serve alongside the fries for a sweet and buttery contrast!
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