Prep: Line a baking sheet with parchment paper and measure all ingredients.
Toast Seeds: Heat a dry pan over medium heat. Add sunflower seeds and toast until lightly golden. Remove and set aside.
Cook Sugar: In a medium saucepan, combine sugar, honey, and water. Cook over medium heat without stirring until sugar melts and turns light amber. Swirl pan gently if needed.
Add Butter and Seeds: Lower heat, add butter, then sunflower and sesame seeds. Stir quickly to coat evenly.
Add Baking Soda: Remove pan from heat. Sprinkle baking soda and salt. Stir—the mixture will foam.
Spread and Cool: Pour the mixture onto parchment. Spread thinly with a spatula. Let cool completely, then break into pieces.