In a large nonstick pan, combine the sugar with the water and corn syrup. Cook over medium-high heat, stirring occasionally, until golden brown.
Stir in the nuts; cook, stirring constantly, until medium brown. Be careful not to burn! Remove from heat; quickly stir in the butter and baking soda. Pour onto the prepared baking sheet. Sprinkle with a little sea salt, if desired. Cool on a wire rack.
When cooled, break into pieces. Store in a tightly covered container.