Crispy Golden Leek and Potato Matchstick Frites Step-by-step instructions

Before you start

Before starting, ensure all vegetables are washed and the leeks are trimmed to use only the white barrels. Prepare a workspace with a mandoline or a very sharp knife. Have a large bowl of cold water ready for the potatoes and a clean, dry salad spinner on hand.

Line a large baking sheet with several layers of high-quality paper towels to absorb excess oil post-frying. Set up the deep-fry station with a heavy-bottomed pot and a thermometer clipped to the side to monitor the oil temperature constantly.

Instructions

Julienning and Drying

1. 1Prepare the Vegetables
   Using a sharp chef's knife or mandoline, carefully julienne the peeled Russet potatoes and cleaned white leek barrels into consistent two-millimeter matchsticks. Place the potato matchsticks into a bowl of cold water to remove excess starch, then rinse thoroughly. Transfer the potatoes to a salad spinner and spin until they are bone-dry, as any surface moisture will cause the oil to splatter dangerously during the frying process.
   Look for Vegetables should be uniform in size and completely dry to the touch.
   Tip Ensure the vegetables are as dry as possible to achieve maximum crunch.

The vegetables should be cut into very fine, uniform strips. The potatoes must be rinsed until the water runs clear to remove surface starch. After spinning, the matchsticks should feel dry to the touch, with no visible water droplets remaining on the surfaces.

If the vegetables are still damp, they will not achieve the desired airy texture during the fry, so take extra time to ensure they are completely dry before proceeding to the next stage of the preparation.

Precision Frying

2. 2Coat and Fry
   Lightly dust the prepared leek matchsticks with cornstarch, shaking off any excess. Heat the peanut oil in a large heavy-bottomed pot until it reaches a steady 360°F (182°C). Working in small batches to maintain oil temperature, carefully lower the potato matchsticks into the hot oil. Fry for approximately ninety seconds until they are golden and weightless. Repeat the process separately for the leek straws, ensuring they do not burn.
   Look for The oil will roar with bubbles as moisture evaporates.
   Tip Use a spider skimmer to carefully remove the straws once they turn golden.

The oil must remain at a steady 360°F (182°C) throughout the process. As the matchsticks hit the oil, they will bubble vigorously. Once the bubbles slow down and the straws look golden and delicate, they are ready to be removed. The leeks will turn golden much faster than the potatoes, so watch them closely. The transformation from raw to perfectly crisp happens very quickly, so stay focused on the pot until the final batch is completed and drained properly.

Seasoning and Serving

3. 3Season and Finish
   Immediately transfer the fried potato and leek matchsticks onto a tray lined with paper towels to drain any excess oil. While still hot, gently toss the crispy straws with fine sea salt and a dusting of smoked paprika. Serve the matchsticks immediately while they are at their peak of crispness to ensure the best texture and flavor for the diners.
   Look for The straws should sound delicate and shatter when handled.
   Tip Seasoning while hot helps the salt and paprika adhere to the straws.

The finished straws should be drained thoroughly on paper towels to remove any residual oil. When seasoned with sea salt and smoked paprika while still warm, the aromas should be fragrant and appetizing. The straws should be light, airy, and hold their shape well when stacked. If they feel oily or heavy, they were likely not fried at a high enough temperature or were not drained sufficiently after leaving the oil. They are now ready to be used as a garnish.

Common mistakes

A common mistake is overcrowding the pot, which causes the oil temperature to drop rapidly and leads to greasy, limp results. Always fry in small batches to keep the temperature stable. Another error is failing to dry the vegetables thoroughly; any remaining moisture creates excessive steam that prevents the matchsticks from becoming properly crisp.

Finally, neglecting to fry the leeks and potatoes separately will result in uneven cooking, as the leeks will inevitably burn long before the potatoes have reached their ideal state of golden crispness.

How to tell it’s done

The matchsticks are done when they appear uniform in golden color and feel weightless when lifted with a spider skimmer. The bubbling in the oil will have subsided significantly, indicating that the majority of the internal moisture has been released.

When tapped against the side of the pot or a bowl, they should produce a crisp, dry sound. They should be removed immediately from the oil at this point to prevent over-browning or developing a bitter, burnt flavor from the leek sugars.