Add the beer and brown sugar to a large saucepan over medium heat.
Stir until sugar has melted.
Bring to a boil. Allow to boil untouched for 3 minutes.
Remove from heat, stir in butter, Sriracha and cayenne.
Add the nuts, stir until all the nuts are well coated.
Line a baking sheet with a silpat (or aluminum foil sprayed with cooking spray), spread the nuts in an even layer on the prepared baking sheet.
Bake at 350 for 6 minutes, stir bake for an additional 6 minutes.
Remove from oven, allow to cool, break apart.