Ingredients
3 medium potatoes, (about 1 1/4 pounds), scrubbed
Extra-virgin olive oil, for frying (3 to 4 cups)
Kosher salt
Preparation
Very thinly slice potatoes on a mandolin (about 1/16 inch thick). Cover in cold water (separately, if using multiple colors) for 1 hour. Swish potato slices around to release starch, then drain. Repeat until water is no longer cloudy. Spread slices out on kitchen towels and pat dry. Let air-dry 15 minutes.
Fill a medium heavy pot halfway with extra-virgin olive oil. Clip a candy or frying thermometer to pot and heat oil to 345°. Add a small handful of potato slices and stir to break apart (temperature will drop and oil will vigorously bubble).
Turn and stir potatoes until bubbling stops completely, about 4 minutes per batch; do not let temperature go above 350°. Remove and drain on paper towels. (If they are still slightly soft in the center after resting a minute, return to oil briefly.) Sprinkle with salt.
Return oil to 345° between batches. (You can reuse the oil later to make more chips; store it in a tightly covered jar for up to a month.) Chips are best eaten the day they are made, but can be stored, once cooled completely, in an airtight container up to 3 days.
