Disposable foil grills may be fun for BBQ sessions on the fly, but they wreak havoc on the environment. The cardboard, bamboo and lava-stone CasusGrill ($20), on the other hand, is fully biodegradable. The single-use grill is the brainchild of Carsten Nygaard Brogger, who created the device and perfected its unusual flame-free bamboo charcoal in his Copenhagen kitchen. Light four corners of the briquette grid and the coals will smolder, ashing over within minutes and hitting 600°F without a blaze. After its 60-minute cooking time is up, simply dig a hole and bury the Casus. Your memories of a picnic will linger longer than the grill does underground.