Homemade fries often come out limp, greasy or falling apart. Many restaurant cooks use a simple extra step: a splash of vinegar in the water they boil the potatoes in before frying or baking.
Why It Works
Potatoes contain pectin, the natural glue that holds their cells together. When you boil cut potatoes, the pectin breaks down and the outside can turn mushy and fall apart before the inside is cooked.
A little acid slows that breakdown. With vinegar in the water, the outside of each fry stays firm while the inside cooks through, so the fry holds its shape and forms a thin, crisp crust when fried or baked.
How to Do It
- Cut russet potatoes into even 1/4- to 1/2-inch sticks. Rinse them in cold water to remove surface starch.
- Blanch: bring a pot of water to a boil with 2 tablespoons of white vinegar and 1 tablespoon of salt per 2 quarts of water. Add the potatoes and simmer 6 to 8 minutes, until just tender but not falling apart.
- Dry: drain and spread them on a towel-lined sheet pan. Let them steam dry for 10 minutes. Dry fries crisp better.
- Cook: fry at 375°F until golden, about 4 to 6 minutes, or toss with oil and bake at 425°F for 30 to 35 minutes, turning once.
Will They Taste Like Vinegar?
No. The vinegar cooks off and the amount is small. If you like salt-and-vinegar fries, you can sprinkle a little malt vinegar on at the table.
More Tips for Crisp Fries
- Use starchy russet potatoes, not waxy red ones.
- Don’t crowd the pan or fryer; crowded fries steam.
- For extra crunch, chill the blanched fries for an hour before frying.
- Salt right after they come out of the oil.
Frequently Asked Questions
Can I use apple cider vinegar?
Yes, any plain vinegar works. White vinegar has the most neutral taste.
Does this work in the air fryer?
Yes. Blanch and dry them, toss with a teaspoon of oil and air fry at 400°F for 15 to 20 minutes, shaking halfway.
Can I blanch ahead?
Yes. Blanch, dry and refrigerate up to a day, then fry or bake.
A splash of vinegar and a little patience are all it takes for fries with real crunch.
