There’s an ultra-bitter battle brewing in the nerdy world of high-end specialty coffee.

Hydrangea Coffee Roasters — a hip, cult-favorite Berkeley roaster with a fanatic, global following among bean geeks obsessed with rare, fruit-fermented roasts — has been plunged into scandal after a bombshell sexual harassment lawsuit was filed against founder Bill Li (also known as Chengxi Li).

Hydrangea and Li were sued last week by employee Ashlynne Wike — who alleges Li subjected her to months of unwanted touching, invasive questions and increasingly disturbing behavior.

Wike filed her complaint Aug. 25 in Alameda County Superior Court, and accuses…

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