Ingredients

For the Potato Dough

• 1 pound (450 g) russet potatoes, peeled and cubed

• 4 to 5 tablespoons cornstarch or potato starch

• 1/2 teaspoon salt

• 1/4 teaspoon chili flakes

• 1/2 teaspoon paprika

• 1/4 teaspoon black pepper

• Pinch of garlic powder, optional

For Frying

• 2 cups (500 ml) neutral oil, such as canola or sunflower oil

For Serving

• Mayo or spicy mayo

• Chopped fresh parsley

• Grated parmesan

Optional Vegan Alternatives

• Vegan mayo

• Vegan parmesan

Equipment

• Medium pot

• Potato masher or potato ricer

• Rolling pin

• Zip-top bag or parchment paper

• Knife or pizza cutter

• Slotted spoon

Instructions

1. Boil the potatoes

Boil the cubed potatoes in lightly salted water for 15 to 20 minutes, or until fork-tender. Drain well, then return them to the hot pot for 1 to 2 minutes to remove excess moisture.

2. Mash until smooth

Mash the potatoes until completely smooth. A ricer gives the best texture, but a masher works too.

3. Make the dough

Transfer the mashed potatoes to a bowl. Add 4 tablespoons of starch, salt, chili flakes, paprika, black pepper, and garlic powder if using. Mix into a soft dough. Add a little more starch if needed.

4. Shape the dough

Place the dough in a zip-top bag or between parchment sheets. Press or roll into a rectangle about 1/2 inch thick.

5. Chill

Freeze for 30 to 45 minutes, until firm but not fully frozen.

6. Cut into fries

Cut the chilled dough into long strips about 1/2 inch wide. Keep them as long as possible without breaking.

7. Fry

Heat the oil to 375°F (190°C). Fry the potato strips in small batches for 3 to 5 minutes, until golden and crisp. Remove with a slotted spoon and drain well.

8. Serve

Serve hot with mayo or spicy mayo, chopped parsley, and grated parmesan. For a vegan version, use vegan mayo or vegan parmesan instead.

If this recipe caught your eye, save the image below to your Pinterest board so you can find it again when you’re ready to make it.

Tips and Tricks

• Dry the potatoes well after boiling. Too much moisture makes the dough soft and harder to shape, so give the potatoes a minute or two in the warm pot after draining.

• Mash while the potatoes are still hot. This helps you get a smoother texture, which makes the Japanese extra long fries easier to cut and helps them fry up more evenly.

• Do not add all the starch at once. Start with the smaller amount, then add more only if the dough still feels too soft. You want a dough that holds together without turning dense.

• Chill the dough until firm. This step makes a big difference. Cold dough is much easier to cut into long strips and less likely to break when you lift it.

• Use a sharp knife or pizza cutter. Clean cuts help the fries keep that neat, extra-long shape.

• Keep the fries similar in size. When the strips are close in thickness, they cook more evenly and finish at the same time.

• Fry in small batches. Crowding the pot lowers the oil temperature and can make the fries greasy instead of crisp.

• Serve them right away. These extra long potato fries are at their best when hot and freshly fried, with the outside still crisp and the center soft.