Mashing: Heat 25 liters of water to 67°C (152°F). Add your crushed malts and stir. Maintain this temperature for a 60-minute mash.
Sparging: After mashing, raise temperature to 75°C (167°F) for mash out. Rest for 10 minutes. Sparge with extra water (around 10 L) at 75°C until pre-boil volume is around 24 liters.
Boiling: Start the boil. Add Magnum hops at the start of the 60-minute boil. Add Polaris hops with 10 minutes remaining. With 5 minutes left, add Nelson Sauvin hops, crushed coriander seeds, and orange peel. Turn off the heat, add crushed green grapes, and let sit for 15 minutes.
Cooling and Fermentation: Cool wort quickly to 20°C (68°F), transfer to a sanitized fermenter, then pitch the yeast. Ferment at 20°C (68°F) for 2 weeks or until fermentation activity stops.
Conditioning: Transfer beer to a secondary fermenter, avoiding sediment. Allow it to condition for 2 more weeks.
Packaging: Package into bottles or kegs, carbonate to 2.5 volumes of CO2, and allow it to age for at least 2 more weeks before enjoying.