Preparation Time: 20 minutes
Cooking Time: 15 minutes
Total Time: 35 minutes
Intensity Level: Mild
Servings: 4 servings
Calories: Approximately 320 calories per serving
Ingredients
For the Potato Mixture
- 4 large potatoes, peeled and diced
- 2 tablespoons cornstarch
- 1 tablespoon potato starch
- 1 teaspoon salt
- ½ teaspoon white pepper
- 1 tablespoon vegetable oil
For Frying
- 4 cups vegetable oil
Optional Seasonings
- Fine sea salt
- Nori (seaweed) powder
- Garlic powder
- Cheese powder
- Japanese chili seasoning
- Furikake seasoning
Equipment Needed
- Large pot
- Potato masher or food processor
- Mixing bowl
- Piping bag with a large round tip
- Deep frying pan or fryer
- Paper towels
- Slotted spoon
Instructions
Step 1: Prepare the Potatoes
Place the diced potatoes into a large pot and cover them with water. Bring the water to a boil over medium-high heat. Cook the potatoes for approximately 12 to 15 minutes or until they become very soft and can easily be pierced with a fork.
Drain the potatoes thoroughly and allow them to sit for 2 minutes to remove excess moisture.
Step 2: Mash the Potatoes
Transfer the cooked potatoes into a large mixing bowl. Mash them until completely smooth. For an extra smooth texture, use a food processor or pass the potatoes through a potato ricer.
The smoother the potato mixture, the easier it will be to pipe long fries later.
Step 3: Create the Dough
Add cornstarch, potato starch, salt, white pepper, and vegetable oil to the mashed potatoes.
Mix thoroughly until a soft and smooth dough forms. The mixture should be firm enough to hold its shape but soft enough to pipe through a pastry bag.
If the dough feels too wet, add an additional tablespoon of potato starch.
Step 4: Prepare for Frying
Transfer the potato mixture into a large piping bag fitted with a round nozzle.
Heat vegetable oil in a deep frying pan or fryer to 350°F (175°C).
Maintaining the correct oil temperature is important. Oil that is too hot may burn the fries before they cook through, while oil that is too cool may make them greasy.
Step 5: Pipe the Long Fries
Carefully pipe long strips of the potato mixture directly into the hot oil. Create strips approximately 10 to 14 inches long.
Use kitchen scissors if needed to cut the dough as you pipe.
Avoid overcrowding the fryer, as this can lower the oil temperature and affect crispiness.
Step 6: Fry Until Golden
Fry the potato strips for 4 to 5 minutes, turning occasionally to ensure even cooking.
Continue frying until the fries become golden brown and crispy on all sides.
Remove the fries using a slotted spoon and place them on paper towels to drain excess oil.
Step 7: Season Immediately
While the fries are still hot, sprinkle them with your preferred seasonings.
Classic sea salt is always a favorite, but Japanese-inspired seasonings such as nori powder, furikake, or garlic seasoning provide authentic flavor.
Step 8: Serve
Arrange the Japanese Long Fries on a serving platter and serve immediately while hot and crispy.
Pair them with Japanese mayonnaise, spicy mayo, ketchup, or your favorite dipping sauce.
Chef’s Tips for Success
Use Starchy Potatoes
Russet potatoes work best because they contain more starch and create a lighter, crispier texture.
Keep the Dough Smooth
Any lumps in the potato mixture may block the piping tip and make it difficult to create long fries.
Monitor Oil Temperature
Use a kitchen thermometer whenever possible. Consistent oil temperature results in evenly cooked fries.
Double Fry for Extra Crispiness
For ultra-crispy fries, fry them once for 3 minutes, let them rest for 5 minutes, then fry again for 2 minutes until golden.
Season Quickly
Apply seasoning immediately after frying so it sticks better to the surface.
Flavor Variations
Seaweed Fries
Sprinkle with nori powder and sea salt for a classic Japanese street-food flavor.
Cheese Fries
Toss with cheese powder for a rich and savory taste.
Spicy Fries
Add Japanese chili seasoning or cayenne pepper for extra heat.
Garlic Butter Fries
Mix garlic powder with melted butter and drizzle lightly over the fries before serving.
Furikake Fries
Finish with furikake seasoning for a blend of sesame seeds, seaweed, and umami flavor.
Storage Instructions
Japanese Long Fries are best enjoyed fresh.
However, leftovers can be stored in an airtight container in the refrigerator for up to 2 days.
To reheat, bake in a preheated oven at 400°F (200°C) for 5 to 7 minutes until crispy again.
Avoid microwaving, as this may soften the fries.
Nutrition Information
Per Serving
- Calories: 320 kcal
- Carbohydrates: 45 g
- Protein: 4 g
- Fat: 14 g
- Saturated Fat: 2 g
- Cholesterol: 0 mg
- Sodium: 420 mg
- Potassium: 780 mg
- Fiber: 4 g
- Sugar: 2 g