1. Peel lotus root with a vegetable peeler and cut into 1/8-in. slices. Soak in a large bowl of water with lemon juice 20 minutes, then drain and pat dry. Mix salt and five-spice powder together in a small bowl.
2. Pour enough oil into a medium pot to come 2 in. up sides. Heat oil until it registers 325° on a deep-fry thermometer.
3. Fry chips in small batches until golden, then put on a plate and sprinkle each batch with a little five-spice mixture while chips are still hot.
*Buy lotus root at Asian markets.