Chablis grand cru on the label is no guarantee of quality, but usually...
Chablis is a lean, sometimes stony white wine made in the Chablis region at north of Burgundy in eastern France. Flavors include gunflint and honey. Chablis is made exclusively from Chardonnay. Suggested food pairings include Fish Stew (tomato-based), Flounder, Sole, and Red Snapper. Chablis and Oysters are considered a classic combination.
Chablis wine usually starts at about $15 and can get to stratospheric heights. For $15 you might enjoy the Cave des Vignerons de Chablis Chablis Signé. Its flavors include apple, peach, and citrus, and you can age it for a couple of years. In the mid twenties go for Jean-Marc Borcard's Chablis Vaugiraut combining floral, apple, and almond flavors. If you are willing to pay $40 and up try René and Vincent Dauvissat Chablis 1er Cru Vaillons. It's powerful, with lots of minerals, spices, and fruit.