Spectacular pulled sugar sweet potato with stretchy caramel threads is a dramatic dessert. A fun family treat with sweet, golden perfection.
Peel and cut the sweet potatoes into batons about 1/2 inch wide and 3 inches long, rinsing under cold water to remove excess starch.
Heat the vegetable oil in a deep, wide pan to 340°F (170°C). Dry sweet potato pieces thoroughly, then lower them carefully into the oil. Fry, turning occasionally, until golden and cooked through—about 6-8 minutes. Remove and drain on paper towels.
In a saucepan, combine sugar, water, and salt. Stir over medium-low heat until dissolved, then increase the heat to medium-high. Do not stir further; swirl the pan gently until the syrup reaches a golden amber caramel, about 320°F (160°C).
Remove the pan from heat. Working quickly, dip each fried sweet potato piece into the caramel using chopsticks or tongs, then pull it out in a sweeping motion, creating sugar threads. Place each on an oiled baking sheet to prevent sticking.
Serve warm for maximum stretch and dramatic sugar threads. For extra crunch, let the caramel harden a few minutes before serving.