Chablis is one of the world's unique expressions of Chardonnay. When carefully grown, the grapes from Chablis transmit a flinty element from the region's Kimmeridgian limestone soils. Apple, melon, peach and lemon flavors complement the steely backbone of the wines. There is often a green character in the most positive way, refreshing and bracing. Wine Spectator's Bruce Sanderson explains.