To get “The Ultimate” level of crunch, you have to move beyond just frying chopped potatoes. The secret to that glass-like exterior and fluffy interior is increasing the surface area and using a double-cook method.
This recipe uses the “Parboil & Shake” technique, which creates a starchy mash on the outside of each potato that fries into a golden, craggy crust.
The Essentials
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The Potato: Use Russets or Maris Piper. Their high starch content is non-negotiable for fluffiness.
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The Fat: Duck fat or beef tallow is king for flavor, but Neutral Oil (Canola/Vegetable) with a high smoke point works perfectly.
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The Secret Weapon: Baking Soda. It breaks down the potato’s pectin, drawing starch to the surface.
Ingredients
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2 lbs Russet potatoes (peeled and cut into 1-inch chunks)
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½ tsp Baking soda
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4 tbsp Extra virgin olive oil or duck fat
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1 tsp Salt (plus more for boiling water)
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Optional Aromatics: 2 cloves smashed garlic, 1 sprig rosemary/thyme
The Step-by-Step
1. The Alkaline Parboil
Bring a large pot of water to a boil. Add a generous pinch of salt and the baking soda. Add the potatoes and simmer for about 8–10 minutes until the edges are softened but the centers are still firm.
2. The “Rough Up”
Drain the potatoes and let them steam dry in the colander for 2 minutes. This is vital—moisture is the enemy of crispiness. Transfer them back to the pot, cover, and shake vigorously.
Why? You want a thick layer of “potato paste” to build up on the edges. This paste becomes the crispy crust.
3. The Infusion
While the potatoes dry, heat your oil in a small skillet over medium heat. Add the garlic and herbs. Cook for 2 minutes until fragrant, then strain the oil into a large bowl (toss the toasted garlic/herbs aside for later).
4. The Roast
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Toss the “roughed up” potatoes in the infused oil until coated.
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Spread them out on a preheated baking sheet. Do not crowd them.
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Roast at 450°F (230°C) for 45–50 minutes.
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The Flip: Using a thin spatula, flip them every 15 minutes to ensure every side hits the hot metal.
Troubleshooting the Crunch
| Problem | Cause | Fix |
| Soggy Bites | Overcrowded Pan | Use two pans. If they touch, they steam instead of fry. |
| Burnt Edges | Heat too high | 450°F is the limit. If your oven runs hot, drop to 425°F. |
| Sticking | Flipped too early | Wait for the crust to fully form before trying to move them. |
The Finish
As soon as they come out of the oven, toss them in a bowl with a little more salt and those saved toasted garlic/herbs. The sound of them hitting the bowl should be like “marbles dropping on glass.”