The Best Crispy Roast Potatoes Ever
Mise en Place / Ingredients[9]
- 4 lbs Russet or Yukon Gold potatoes, peeled and cut into 2-inch chunks (Idaho Russet)
- 2 quarts Water (for alkaline parboiling)
- 0.5 tsp Baking soda (sodium bicarbonate) (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
🛒 US Supermarket Brand Guide
Alkalinizes boiling water to rapidly break down surface pectin. • 📍 Baking aisle.
High starch-to-water ratio yields the crispest roast. • 📍 Produce aisle.
Cooking Sequence & Checkpoints
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.
✓ Checkpoint: Frayed exterior surfaces.
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.
✓ Checkpoint: Creamy white starch paste coating chunks.
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.
✓ Checkpoint: Glossy herb-oil-coated potatoes.
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.
✓ Checkpoint: Deep amber crackling shell flecked with garlic, rosemary, and parsley.
🔬 Why It 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.
⚠️ Troubleshooting:
Soggy oily potatoes: Give potatoes plenty of space and roast at 450°F (230°C) minimum.