Mash In: Heat 3.5 gallons (13 liters) of water to 104°F (40°C). Add all the crushed malts and stir thoroughly to avoid clumps. Allow the temperature to rise to 122°F (50°C) for protein rest. Hold this temperature for 20 minutes.
First Decoction: Take a thick portion of the mash (about one-third) and transfer it to another pot. Heat it up to 158°F (70°C) and hold for 10 minutes. Then, raise the temperature to 168°F (76°C) for mash-out. Return the decoction back to the main mash, raising the temperature to 154°F (68°C) for saccharification rest.
Second Decoction: Take another thick portion of the mash (about one-third) and transfer it to the other pot. Heat it up to 168°F (76°C) for mash-out. Return the decoction back to the main mash, raising the temperature to 162°F (72°C) for the second saccharification rest.
Third Decoction (optional): Repeat the process for a third decoction, if desired, to achieve a rich malt profile.
Lautering: After completing the decoction steps, begin the lautering process. Sparge with 170°F (77°C) water to extract the sugars fully.