Toast the sesame seeds: Heat a dry skillet over medium heat. Add sesame seeds and toast until golden and fragrant, stirring often. Set aside.
Prepare the baking surface: Line a baking sheet with parchment paper or lightly grease with butter.
Cook the sugar mixture: In a heavy saucepan, combine sugar, honey, and water. Stir until sugar dissolves, then let it boil without stirring until the syrup turns a golden amber color.
Add butter and flavor: Remove from heat and quickly stir in butter, vanilla, and salt. The mixture will bubble—this is normal.
Mix in sesame seeds: Immediately add toasted sesame seeds and stir to coat them evenly in the caramel.
Spread the mixture: Pour onto the prepared baking sheet and quickly spread into a thin, even layer with a greased spatula.
Cool and break: Let cool completely. Break into shards or cut into bars with a sharp knife.
