Chestnut
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Apparently "chestnut beer" is a thing. See Guerra NP, Torrado-Agrasar A, López-Macías C, et al. Use of Amylolytic Enzymes in Brewing. In: Preedy VR, ed. Beer in Health and Disease Prevention. Academic Press; 2009:113–126.
Chestnut in beer production: applicability and effect on beer quality parameters .. Chestnut may be useful for making gluten-free beer