This sweet treat can be served on its own, like candy, or crumbled over ice cream.
Lightly grease a 12-by-9-inch pan, and set aside. Place the honey and sugar in a medium saucepan set over medium heat, and cook, stirring, until the sugar has dissolved. Bring mixture to a boil, and let boil until it reaches 320 degrees, about 6 minutes.
Remove from heat, add the sesame seeds, almonds, and sunflower seeds, and stir to combine. Pour the mixture onto the prepared pan, and spread out using a greased spatula. Place pan on a wire rack to cool. When brittle is cooled but not hard, ease it out of pan. Place brittle on a wire rack to cool completely. Break the brittle into serving-size pieces.
You can substitute peanuts or pistachios for almonds, and pepitas for sunflower seeds.