When you do a decoction, you are producing melanoidins at boiling temps, as the decoction is not boiled long enough or hard enough to concentrate. I don't boil the decoctions too hard, as I don't want scorching to happen.
Pressure cooker decoction, baby No constant stirring, no scorching
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The cereal/decoction mash is in a pot, that goes into the pressure cooker. The pressure cooker has a false bottom and water under the false bottom. The goods never go over the steam temp, so no scorching, and no need to stir.
IIRC, Jeff has a 22 quart pressure cooker. Good size for a CAP cereal mash.