The Best Crispy Roast Potatoes Ever
Parboiled in alkaline baking soda water, roughed up to create a thick starch paste, and roasted in garlic-rosemary infused oil for the ultimate glass-like crunch and fluffy interior.
Glassy golden-brown crust that shatters audibly under a fork, enclosing cloud-fluffy mashed potato interior.
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Step-by-Step Video Guide & Creator Variants
Cocinanding Guide vs. Creator Video: Related Video — Unconfirmed Comparison (J. Kenji López-Alt): This public video is provided as a visual reference for the dish. Exact ratios, timings (20m prep / 50m cook), and US grocery suggestions on this page are independently standardized by Cocinanding.
The Best Crispy Roast Potatoes Ever
J. Kenji López-Alt
Public YouTube video embedded as a visual technique reference. The written recipe guide, verified timings, and US grocery brand picks are independently authored by Cocinanding (not a commercial partnership).
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What to Buy & Brand Guide
Editorial US Grocery Suggestions • Zero Paid Placements
Arm & Hammer Pure Baking Soda
Standard Size: 16 oz boxWhy it matters: Alkalinizes boiling water to rapidly break down surface pectin.
Where to find in US: Baking aisle.
Acceptable substitutes: Any pure baking soda.
Idaho Russet Potatoes
Standard Size: 5 lb bagWhy it matters: High starch-to-water ratio yields the crispest roast.
Where to find in US: Produce aisle.
Acceptable substitutes: Yukon Gold potatoes.
Why This Recipe Works
💡 Alkaline Water Pectin Breakdown
Baking soda raises water pH, accelerating the breakdown of surface pectin into an ultra-thin layer of potato starch slurry that bakes at 450°F (230°C) into crispy armor.
Ingredients for 6 ServingsUS Standard Measurements
- 4 lbs Russet or Yukon Gold potatoes, peeled and cut into 2-inch chunks⭐ Recommended: Idaho Russet
- 2 quarts Water (for alkaline parboiling)
- 0.5 tsp Baking soda (sodium bicarbonate)⭐ Recommended: Arm & Hammer
- 5 tbsp Extra virgin olive oil or rendered duck fat
- 2 tbsp Fresh rosemary, minced
- 3 cloves Fresh garlic cloves, minced
- 0.25 cup Fresh flat-leaf parsley, minced
- 2 tbsp Kosher salt
- 0.5 tsp Freshly ground black pepper
Required Kitchen Tools
- ✓Large rimmed baking sheet
- ✓Large stockpot
- ✓Colander
Step-by-Step Preparation
Alkaline Parboil
Bring 2 quarts of water to a boil with 2 tbsp kosher salt and 0.5 tsp baking soda. Add peeled potato chunks and boil 10 minutes until a knife pierces with slight resistance.
The Vigorous Shake
Drain well in colander and let steam dry 1 minute. Shake roughly for 30 seconds to build a thick coat of mashed potato starch paste on each chunk.
Herb Oil Infusion
Gently warm olive oil with 3 cloves minced garlic, 2 tbsp minced fresh rosemary, and 0.5 tsp black pepper for 2 minutes until golden. Strain fragrant oil over potatoes, reserving the crisp garlic-herb solids, and toss to coat.
High-Heat Roast
Roast on a preheated baking sheet at 450°F (230°C) for 50 minutes, flipping twice until deeply blistered. Toss immediately with the reserved fried garlic-rosemary bits and 0.25 cup minced fresh parsley.
Common Mistakes & Troubleshooting
Avoid the mistakes that ruin this recipe
⚠️ Problem: Soggy oily potatoes
Underlying Cause: Crowded baking sheet or low oven temp.
Fix & Solution: Give potatoes plenty of space and roast at 450°F (230°C) minimum.
Frequently Asked Culinary Questions
Specific ingredient, technique, and US grocery answers for The Best Crispy Roast Potatoes Ever
❓ Which brand of baking soda should I look for in US grocery stores for The Best Crispy Roast Potatoes Ever?
Editorial suggestion: Arm & Hammer Pure Baking Soda (Arm & Hammer). Alkalinizes boiling water to rapidly break down surface pectin. Typical aisle: Baking aisle. Acceptable substitute: Any pure baking soda.
❓ How do I fix: "Soggy oily potatoes"?
Common cause: Crowded baking sheet or low oven temp. Practical fix: Give potatoes plenty of space and roast at 450°F (230°C) minimum.
The Triumph of Culinary Physics
J. Kenji López-Alt changed holiday cooking forever with this scientifically engineered technique. The alkaline boiling water and vigorous shaking method produces a potato crust superior to deep frying.
Visual Kitchen Infoguide (Print or Save to Phone)
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