Japanese long fries are those impossibly long, spiral-cut potatoes you see twirling on a stick at festivals and night markets, and yes, you can absolutely make them at home. The trick is a spiral cutter (or a steady hand and a skewer), a quick ice-water soak, and a thin, crisp batter that clings to every ridge.
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I tested this recipe five times in my own kitchen, and the game-changer was keeping the oil at a steady 350F (175C). Too hot and the outside browns before the potato cooks through; too cool and you get a soggy, greasy spiral. Get that temperature right and you'll hear that perfect crunch.
These are a party trick and a snack in one. Serve them hot with kewpie mayo, tonkatsu sauce, or a dusting of furikake, and watch them disappear before you can fry the next batch. Improvise with the seasonings, that's half the fun!
Why You'll Love This Recipe
About the Ingredients
4 large russet potatoes (about 2 lb / 900g), scrubbed
Russets fry up fluffiest because of their high starch. Yukon Golds work too but come out a bit denser, so add 1 extra minute of frying.
2 cups (480ml) ice-cold water, for soaking
The cold soak rinses off surface starch so the spirals stay separate and crisp. No ice? Very cold tap water is fine in a pinch.
1 cup (125g) all-purpose flour
All-purpose gives a light, crisp shell. For a gluten-free version, use a 1-to-1 gluten-free flour blend and expect a slightly softer crust.
3 tbsp (24g) cornstarch
Cornstarch is the secret to a shatteringly crisp coating. Potato starch is a great traditional substitute if you have it.
1 tsp garlic powder
Adds savory depth without fresh garlic burning in the oil. Onion powder swaps in nicely for a milder flavor.
1 tsp fine sea salt, plus more for finishing
Fine salt dissolves evenly into the batter. Flaky salt goes on at the end for that finishing crunch.
1/2 tsp smoked paprika
Gives a warm color and gentle smokiness. Regular paprika or a pinch of cayenne works if you want more heat.
1 1/2 cups (360ml) cold sparkling water or lager, for the batter
The bubbles make the batter airy and crisp. Club soda or plain cold water both work, though the crunch is slightly less dramatic.
6 cups (1.4L) neutral oil, such as canola or peanut, for frying
Neutral oil keeps the flavor clean and handles high heat well. Peanut oil gives a subtle nutty note that's lovely here.
Kewpie mayo, tonkatsu sauce, and furikake, for serving
Kewpie is richer and tangier than regular mayo. Regular mayo thinned with a little rice vinegar is a solid stand-in.
Tips & Tricks
Soak and dry thoroughly
Pat the spirals bone-dry after soaking, because any water left on the potato makes the oil sputter and the batter slide off.
Keep the oil steady
Use a thermometer and hold 350F (175C); adding too many fries at once drops the temperature and makes them greasy.
Fry in small batches
Three or four spirals at a time keeps the oil hot and gives you even golden color on every ridge.
Pro Tips
Step-by-Step Instructions
1. Spiral-cut the potatoes
Push each potato onto a spiral cutter or a long skewer and cut into a continuous spiral, stretching it gently to about 10 inches long. If you don't have a cutter, use a sharp paring knife in a slow turning motion, keeping the coil about 1/4 inch thick.
2. Ice-water soak
Submerge the spirals in the ice-cold water for 15 minutes to rinse off surface starch. This is what keeps them from sticking together and going limp.
3. Dry completely
Drain the spirals and pat them very dry with clean kitchen towels, then let them air-dry for 5 minutes. Any moisture left behind will make the batter slide off in the oil.
4. Mix the batter
Whisk the flour, cornstarch, garlic powder, salt, and smoked paprika in a wide bowl, then pour in the cold sparkling water and whisk just until smooth. A few small lumps are fine, so don't overmix or the batter turns tough.
5. Heat the oil
Pour the neutral oil into a deep, heavy pot and heat to 350F (175C) over medium-high heat, checking with a thermometer. A drop of batter should sizzle and rise immediately when the oil is ready.
6. Coat and fry
Dip each spiral in the batter, let the excess drip off, and lower it carefully into the oil. Fry 3 to 4 at a time for 3 to 4 minutes, turning once, until deep golden brown and the bubbling at the edges slows. The internal potato should be tender when pierced with a skewer.
7. Drain and season
Lift the fries out with tongs and drain on a wire rack set over a tray for 1 minute. Sprinkle immediately with flaky salt so it clings to the hot crust.
8. Serve hot
Arrange on a platter and drizzle with kewpie mayo and tonkatsu sauce, then shower with furikake. Serve right away while the spiral ridges are still shatteringly crisp.
Delicious Variations
Cheese-dusted spirals
Toss the hot fries in powdered parmesan and a little garlic salt for a savory, snackable twist.
Spicy gochujang glaze
Brush the fried spirals with a mix of gochujang, honey, and rice vinegar for a sticky-sweet kick.
Loaded festival style
Top with shredded cheese, chopped scallions, and a drizzle of spicy mayo, then broil 1 minute until melted.
How to Store Japanese Long Fries
Refrigerator
Best eaten fresh, but leftovers keep in an airtight container in the fridge for up to 2 days. They will lose their crunch, so plan to re-crisp them.
Freezer
Freeze the fried, cooled spirals in a single layer for up to 1 month. Reheat straight from frozen without thawing for the best texture.
Reheating
Reheat in a 400F (200C) oven or air fryer for 5 to 7 minutes until crisp again. Skip the microwave, which steams them soft.
Frequently Asked Questions
Q: What are Japanese long fries made of?
Japanese long fries are spiral-cut potatoes coated in a thin flour-and-cornstarch batter and deep-fried on a skewer. The spiral shape creates lots of crispy edges, and they're usually served with mayo and a savory sauce.
Q: Can I make Japanese long fries without a spiral cutter?
Yes, you can spiral-cut a potato with a long skewer and a sharp paring knife by turning the potato slowly as you cut. It takes a little practice, but keeping the coil about 1/4 inch thick gives you the same crispy result.
Q: Why did my long fries turn out soggy?
Soggy fries usually mean the oil was too cool or the potatoes were still wet when they went in. Dry the spirals thoroughly and hold the oil at 350F (175C), frying only a few at a time.
Q: What sauce goes with Japanese long fries?
Kewpie mayo and tonkatsu sauce are the classic pairing, often drizzled together. Furikake, spicy mayo, or a gochujang-honey glaze are all delicious alternatives.
Q: Can I air-fry Japanese long fries instead of deep-frying?
Yes, air-fry the battered spirals at 400F (200C) for 10 to 12 minutes, flipping halfway, though the coating will be a bit less crisp than deep-fried. Spray them lightly with oil first for better browning.
Give these Japanese long fries a try at your next movie night or backyard hangout, and don't be shy with the toppings. Tag me in your spiral potato photos, I love seeing what you create. Cook smart, eat happy.
Japanese Long Fries
Japanese long fries are extra-long crispy potato spirals on a stick, coated in a light savory batter and fried golden for the ultimate street-food snack.
🧂 Ingredients
- 4 large russet potatoes (about 2 lb / 900g), scrubbed
- 2 cups (480ml) ice-cold water, for soaking
- 1 cup (125g) all-purpose flour
- 3 tbsp (24g) cornstarch
- 1 tsp garlic powder
- 1 tsp fine sea salt, plus more for finishing
- 1/2 tsp smoked paprika
- 1 1/2 cups (360ml) cold sparkling water or lager, for the batter
- 6 cups (1.4L) neutral oil, such as canola or peanut, for frying
- Kewpie mayo, tonkatsu sauce, and furikake, for serving
📋 Instructions
- 1Spiral-cut the potatoes — Push each potato onto a spiral cutter or a long skewer and cut into a continuous spiral, stretching it gently to about 10 inches long. If you don't have a cutter, use a sharp paring knife in a slow turning motion, keeping the coil about 1/4 inch thick.
- 2Ice-water soak — Submerge the spirals in the ice-cold water for 15 minutes to rinse off surface starch. This is what keeps them from sticking together and going limp.
- 3Dry completely — Drain the spirals and pat them very dry with clean kitchen towels, then let them air-dry for 5 minutes. Any moisture left behind will make the batter slide off in the oil.
- 4Mix the batter — Whisk the flour, cornstarch, garlic powder, salt, and smoked paprika in a wide bowl, then pour in the cold sparkling water and whisk just until smooth. A few small lumps are fine, so don't overmix or the batter turns tough.
- 5Heat the oil — Pour the neutral oil into a deep, heavy pot and heat to 350F (175C) over medium-high heat, checking with a thermometer. A drop of batter should sizzle and rise immediately when the oil is ready.
- 6Coat and fry — Dip each spiral in the batter, let the excess drip off, and lower it carefully into the oil. Fry 3 to 4 at a time for 3 to 4 minutes, turning once, until deep golden brown and the bubbling at the edges slows. The internal potato should be tender when pierced with a skewer.
- 7Drain and season — Lift the fries out with tongs and drain on a wire rack set over a tray for 1 minute. Sprinkle immediately with flaky salt so it clings to the hot crust.
- 8Serve hot — Arrange on a platter and drizzle with kewpie mayo and tonkatsu sauce, then shower with furikake. Serve right away while the spiral ridges are still shatteringly crisp.
Elena focuses on healthy cooking and meal prep for people with limited time and budget. She shares flexible recipes and shortcuts that don’t sacrifice flavor.
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