Perform a protein rest at 125F for 15min, then pull off slightly less than 1/3 (1.16gal/4.4L) of the thickest mash and place it in a separate pot. Bring the pot slowly up to 158F and hold for 15min, then slowly bring it up to a boil and proceed to boil for 10min. Stir often so the grains do not burn, but try to allow some 'browning' to help darken the colour and enhance the flavour/aroma profiles. Add the decoction back to the 125F mash, little by little, aiming for a beta rest temperature of 148F. Hold this temperature for 30min while adding back any leftover decoction (if any) as it cools. After this has finished, pull off roughly 1/6 (0.7gal/2.6L) of the thickest mash a second time and place it in the separate pot. Slowly bring the pot up to a boil and continue to boil for 10min. Add the second decoction back to the mash, little by little, aiming for an alpha rest temperature of 158F. Hold this temperature for 30min while adding back any leftover decoction (if any) as it cools. Once this rest has finished, raise the temperature up to a mash out rest of 167F and hold for 10min. After the decoctions and mash out are finished proceed to sparge/lauter as usual.

Yeast, pitch at 48-58. Diacetyl rest @ 65 near end of primary fermentation. Lager 6-8 weeks, starting @ 50 and dropping to near freezing.