Preheat oven to 300 degrees F and line a baking sheet with parchment paper or silpat.

Add the peanuts, sugar, beer and salt to a medium-sized pot and heat on medium-high, stirring until mixture comes to a boil.

Once it comes to a boil, reduce heat to medium-low and stir until the syrup has almost dissolved (about 10 minutes).

Remove pot from the heat and stir in vanilla.

Spoon nuts onto the prepared baking sheet and spread with a rubber spatula.

Place the tray in the oven and cook for 10 minutes. Remove tray and stir the nuts on the tray. Place tray back in oven and cook for an additional 10 minutes.

Remove the nuts from the oven and cool on tray. Separate the nuts and store in an airtight container.