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Crispy Potatoes Without Deep Frying Science and Techniques Summary

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Crispy Potatoes Without Deep Frying: Science and Techniques Summary

Clip title: How to Get Crispy Potatoes Without Deep Frying | Techniquely with Lan Lam Author / channel: America’s Test Kitchen URL: https://www.youtube.com/watch?v=FykplzYrHvM

Summary

This video, part of the “Techniquely” series by Cook’s Illustrated, explores the science behind achieving perfectly crispy potatoes without the need for deep-frying, offering three distinct recipes as examples. The host, Lan Lam, explains that while traditional French fries are deep-fried twice to first cook the interior and then crisp the exterior, the core principle of crispiness lies in combining starch, fat, and heat effectively. Starch molecules, initially packed into crystals, absorb water and break open during cooking. When heated further to drive off this water, the remaining dry, tangled web of starch becomes crispy or crunchy, with oil facilitating even heating and preventing water from softening the texture. The overarching lesson is to separate the cooking and crisping processes.

The first technique demonstrated is for Roasted Smashed Potatoes, using small, thin-skinned red potatoes. The potatoes are first cooked through by steaming them on a baking sheet with a small amount of water, tightly covered with foil, at a high temperature (500°F). This steaming ensures uniform cooking, preventing uneven heating that would occur if exposed directly to dry oven heat. Once tender, the potatoes are lightly oiled, smashed to expose more starchy surface, re-oiled, seasoned, and then roasted uncovered until beautifully browned and crispy. The smashing action creates broad, flat surfaces that make excellent contact with the hot pan, promoting faster browning and a delightful crunch.

Next, the video covers Home Fries and Thick-Cut Oven Fries, each employing a different strategy for crisping. For Home Fries made with russet potatoes, the exterior is pre-treated by boiling the diced potatoes with baking soda. This raises the water’s pH, breaking down the potato surface to create a mushy layer rich in free starches, while leaving the interior raw. After draining, the potatoes are tossed over low heat to dry, seasoned with salt, butter, and cayenne, and then baked on a hot sheet pan. The pre-treatment combined with direct contact on the hot pan results in a substantial, crunchy shell surrounding a fluffy interior.

Finally, for Thick-Cut Oven Fries, where boiling with baking soda would cause the wedges to break apart, a cornstarch slurry is used. Cornstarch is mixed with water and microwaved until it thickens into a paste, which is then used to coat the potato wedges. These coated wedges are baked, initially covered with foil to steam and cook through, and then uncovered to brown and crisp. This method creates a delicate, frizzy cornstarch shell that encases a tender, moist potato interior. Each of these recipes successfully delivers crispy, flavorful potatoes by focusing on either cooking the interior first and then crisping the exterior, or pre-treating the exterior before cooking and crisping, all without the mess and effort of deep-frying.

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