Heat the sugar, honey, water, salt, cinnamon and cayenne over medium heat. Stir until the sugar dissolves then continue to heat until the caramel reaches 300 degrees. Turn off the heat and quickly stir in the pepitas. Pour onto a pan lined with parchment or a silicone mat. Use a rubber spatula to spread the brittle out as thinly as possible. Allow to cool completely then break into shards. Keep at room temperature in an airtight container.