Line a baking sheet with parchment paper and set aside.
Place sugar, water, and jam in a medium saucepan and stir to combine. Cook over medium-high heat, without stirring, until mixture starts to brown, about 10 minutes. Gently swirl the pan until the mixture is an even, deep amber color, about 1 minute more.
Immediately remove from heat and quickly stir in nuts and salt. Pour immediately onto the prepared baking sheet, spread in an even layer, and let cool. Once cool, break into small pieces and serve.