I haven't tried the method myself, but I can think of several things that it would do:
1) As you say, I don't know that you'd get much flavor out of it. Fruit flavor components tend to be pretty volatile, so they'd (probably) get boiled off after the mash.
2) If you use the same amount of fruit you would have in the secondary (generally around .5-1lb per gallon), it could have a significant impact on your mash pH, which could alter your efficiency.
Not saying it would be a nonviable method, of course; I think it'd just depend on what you hope to get out of your fruit. I don't think that it would ever be as effective as fruiting in the secondary, though.
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