The taste is somewhat nutty, sometimes bitterish.
"Studies of American Fungi. Mushrooms, Edible, Poisonous, etc."
George Francis Atkinson
Here we tasted some very fair still red wine, made from the same grapes as champagne, remarkably deep in colour, full of body, and with that slight sweet bitterish flavour characteristic of certain of the better-class growths of the south of France.
"Facts About Champagne and Other Sparkling Wines"
Henry Vizetelly
In this land they heard nothing, saw nothing, felt nothing, smelled nothing, tasted nothing, that was offensive to their stomach or mind; only when they tasted of the water of the river over which they were to go, they thought that tasted a little bitterish to the palate, but it proved sweeter when it was down.
"The Works of John Bunyan Volume 3"
John Bunyan