27 C.F.R. § 7.144
(a) General. Any malt beverage that has been fermented or flavored only with one or more ingredients (such as honey or certain fruits) that the appropriate TTB officer has determined are generally recognized as traditional ingredients in the production of a fermented beverage designated as “beer,” “ale,” “porter,” “stout,” “lager,” or “malt liquor” may be labeled in accordance with trade understanding following the rules set forth in this section.
(b) Rules for designation.