Maybe a kind of berry-taste...?

Or old timey medicines that were mostly alcohol. Wheat can be used to make (alone or in part of) various alcohols (Vodka, Whiskey, Gin, Schnapps, Baijiu, various sweet liqueurs), and flowers are used in others (Vermouth, Gin, Creme de Violette, Rose Liquors, Hibiscus liqueurs, Elderflower liquer). So the Skyrim one, depending on ratios would probably just taste like you're pounding back some sweet floral hard liquor.

Maybe that's why wheat is included, to make into alcohol.

Well, in-game alcohol restores stamina, so I’m not sure if they’d use it to make health potions

Isn't health just the division stamina of your body's cells?