Pat the chicken pieces dry. Lightly season all sides with fine sea salt. In a large bowl, whisk together the buttermilk, salt, garlic powder, onion powder, paprika, white pepper, cayenne if using, and hot sauce if using. Add the chicken and turn every piece until fully coated. Cover and refrigerate for at least 2 hours, ideally overnight. The overnight brine is better. Two hours works, but it is the weaker version. The buttermilk seasons the meat, slightly tenderizes the surface, and gives the dredge something to grip. Buttermilk's mild acidity works on the chicken's surface proteins over the extended soak, tenderising gently while its slightly thickened texture also clings to the meat better than a thinner liquid would — that clinging quality is part of what gives the first dredge such a good initial surface to bond with.

In a wide bowl or tray, whisk together the flour, cornstarch, salt, garlic powder, onion powder, paprika, white pepper, black pepper, and baking soda. The flour gives body, the cornstarch lightens the crust, and the baking soda helps with browning and texture. Do not get clever and add too much baking soda — it will taste bitter and soapy. Cornstarch fries into a lighter, crisper texture than flour alone would produce, while the small amount of baking soda raises the batter's pH slightly, which speeds up browning reactions in the fryer — useful in the small amount specified, but quickly unpleasant if overdone.

Remove one piece of chicken from the buttermilk, letting the excess drip off but not wiping it clean. Place it into the dry dredge. Press the dredge firmly into every surface, especially around joints, folds, and skin edges. This pressing step is not decoration — it is what builds the craggy crust. Shake off only the loose flour that is barely attached. Transfer the coated chicken to a wire rack and repeat with all pieces. Leaving the buttermilk clinging rather than wiping it off gives the dry dredge plenty of moisture to bind to immediately — that residual buttermilk is what turns the pressed flour into a genuinely adherent first layer rather than a loose, easily shed dusting.

Let the dredged chicken rest on the rack for 5–10 minutes. The coating should hydrate slightly and look patchy, rough, and damp in spots. If it still looks like dry loose flour everywhere, it has not set yet. This short rest lets the buttermilk clinging beneath the flour continue absorbing into the dry coating, transforming it from a powdery surface into a slightly tacky, semi-set layer — that transformation is a prerequisite for what the cold-water dip does next.

Fill a bowl or container with ice-cold water. Working one piece at a time, lower the dredged chicken into the cold water for 10–20 seconds without moving it around aggressively. Lift it out and let the excess water drip off for a few seconds. Return the piece immediately to the dry dredge. Press the flour mixture firmly into the chicken again, building a thick, rough, uneven coating. Transfer back to the wire rack. This step is the whole trick. The cold water rehydrates the first coating into a sticky paste, then the second dredge grabs onto it and creates the heavy craggy crust. Skip it and you get normal fried chicken, not the crispiest version. The brief ice-water dunk partially dissolves the surface of the already-set first coating into a sticky, paste-like consistency without washing it away entirely — that sticky surface is exactly what gives a second layer of dry dredge something substantial to adhere to, building real thickness rather than simply repeating a thin single coat.

Let the fully dredged chicken rest for another 10–15 minutes while the oil heats. The crust should look rugged and uneven, with visible bumps and ridges. If the coating looks smooth, you were too gentle. Press harder next time. A visibly rough, uneven surface at this stage is the clearest indicator that enough pressure was used throughout both dredging stages — a smooth surface means the flour was patted on rather than pressed in, and that difference shows up directly in how craggy the fried crust ends up being.

Heat the oil to 150–155°C. Fry in batches, without crowding the pot. Start with the smallest pieces and finish with the largest pieces. Approximate first-fry times: whole wings 8–10 minutes, drumsticks 10–12 minutes, thighs 13–16 minutes. The chicken should be pale golden to medium golden after the first fry, with the crust set but not yet deeply crisp. Transfer to a wire rack. Do not stack the chicken on paper towels. That steams the crust and ruins the whole point. This lower-temperature first fry is calibrated to cook the chicken through and set the thick, double-pressed crust without pushing it toward deep colour — that colour-building is deliberately saved for the second, hotter fry, the same reasoning that governs the two-stage fry for standard fries elsewhere in this collection.

Let the chicken rest on the rack for 10 minutes. This pause lets the internal heat equalize and allows surface steam to escape before the final crisping fry. Allowing residual heat to distribute more evenly through each piece during this rest reduces the risk of the second fry overcooking the exterior before the interior has fully caught up — it's a similar logic to resting a roast before carving, applied to a fried crust instead.

Increase the oil temperature to 185–190°C. Fry the chicken again in batches until deeply golden-brown, craggy, and aggressively crisp. Approximate second-fry times: whole wings 2–3 minutes, drumsticks 3–4 minutes, thighs 4–6 minutes. The crust should be dark golden, rough, and crunchy across the whole surface. The internal temperature must reach: wings and drumsticks 74°C, thighs 80–85°C for better texture around the bone. Since the chicken is already fully cooked from the first fry, this second, much hotter pass exists purely to drive off remaining surface moisture and build deep, aggressive colour and crunch across the thick, double-pressed crust — it moves fast precisely because it isn't also responsible for cooking the meat.

Transfer the fried chicken to a clean wire rack. Let it rest for 5 minutes before serving. Serve hot, while the crust is still loud and crisp. A brief final rest lets the crust's structure fully set after the intense heat of the second fry, while staying well within the window where the chicken is still audibly, genuinely crisp when served.