Mutton was the meat of mature sheep or goat used as food.
In 2367, Miles O'Brien expressed his intention to introduce Keiko O'Brien to several foods he remembered from his childhood, including mutton shanks. (TNG: "The Wounded")
In 2376, mutton was one of the meals that Neelix wanted to prepare in honor of Tom Paris' popular holoprogram Fair Haven. (VOY: "Fair Haven")
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