In a heavy saucepan over medium heat, combine sugar, cream, corn syrup, and salt. Stir constantly until the sugar dissolves and the mixture begins to boil.
Attach a candy thermometer. Cook without stirring until it hits 260°F, about 15–20 minutes. The mixture should bubble thickly and turn slightly golden.
Pour the hot mixture onto a buttered marble slab or greased baking sheet. Don’t spread it. Let cool for 5–7 minutes until it’s glossy and just cool enough to handle.
With buttered hands, start pulling like taffy—stretch, fold, and repeat for 10–15 minutes. It should turn pale, creamy, and firmer as you go.
Roll into ropes on a buttered surface. Let set for 5–10 minutes, then cut into bite-sized pieces using greased scissors or a sharp knife. Cool completely before serving.