Active Time

　　30 min

　　Total Time

　　30 min

　　

Ingredients

Makes about 3 cups

　　1 large onion (3/4 lb), halved lengthwise

　　About 3 cups vegetable oil for frying

　　

Special Equipment

a Japanese Benriner or other adjustable-blade slicer; a deep-fat thermometer

　　

Step 1

Very thinly slice onion lengthwise with slicer.

　　

Step 2

Heat 2 inches oil in a 2-quart heavy saucepan over moderate heat until thermometer registers 340°F, then fry onion in 6 batches, stirring occasionally, until golden brown, 1 to 1 1/2 minutes per batch (watch closely; onion can burn easily). Quickly transfer each batch with a slotted spoon to fresh paper towels to drain, then sprinkle lightly with salt. (Onion will crisp as it cools.) Return oil to 340°F between batches.

　　Cooks' note:

　　Onions can be fried 6 hours ahead and kept, uncovered, at room temperature.