On New Year’s Eve, to accompany Royal Ossetra caviar from Petrossian, served plain on lightly toasted baguette, I opened the Champagne André Beaufort Grand Cru Brut Nature 2005, from a house in the Grand Cru village of Ambonnay that produces a total of about 2,500 cases annually. Winemaker Jacques Beaufort is, from what I understand, eccentric and reclusive, a devotee of biodynamic practices that gradually grew from organic methods undertaken after Beaufort fell ill, purportedly from contact with chemical pesticides and herbicides. He employs only natural yeast from the vineyard, and ages the wines as long as possible on the lees in the bottle. The domaine’s vineyards consist of 80 percent pinot noir grapes and 20 percent chardonnay. The sense of dedication to an ideal, even an obsession if that is not too strong a word, permeate the Champagne under review today.

The color is medium gold, the tiny bubbles steady, gentle, somehow expressive, and, in fact, the whole package here feels the opposite of the exuberant, scintillating Champagnes one often encounters; this seems thoughtful, studied, utterly harmonious. The first impression is of citrus fruit slightly roasted and slightly honeyed, though this is very dry, even austere in the farther reaches of the finish. (“Brut Nature” means that there was no added sugar in the dosage.) There’s a paradoxical note of apple skin, an element of chalk and seashell, and hints of grapefruit rind, lime peel and hazelnuts, then quince and candied ginger and a touch of cinnamon bread. André Beaufort Grand Cru Brut Nature 2005 is both rich and delicate, savory and elegant, bracing and ethereal; a saline streak highlights brisk acidity and leads to a conclusion woven of limestone minerality, clove-like spice and almost bitter grapefruit pith, altogether mildly, charmingly effervescent. 12 percent alcohol. A highly individual Champagne and one unlike any Champagne I have experienced. Excellent. I sprang for $130 locally — gasp! — but come on, it was for New Year’s Eve.

Imported by North Berkeley Wine, Berkeley, Calif.