I think its primary function is to enhance head retention. 8oz of flaked wheat or 2-4 ozs of flaked barley would also work well.
If you just omit it, you'll probably notice no difference in flavor, but won't have as good head retention, I'm guessing.
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Primary: none
Secondary:
Bottle conditioning: Robust Porter
Drinking: Saison Dupont clone, tripel
Coming soon: Columbus APA, Rich Red ale
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