Have done it with black malts for a coffee oatmeal stout the dark malls and coffee were added to a gallon of cold water 24 hours prior to brew day In a brew bag The Main mash was done with 4.5 gallons in another BlAB the cold coffee/ Dark grains infusion was added to the boil with twenty minutes remaining along with a couple cinnamon sticks The beer was smooth with out any toasty bitterness Some people liked it and some did not but you could taste the difference
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