As the name suggests, this can be either a lager or ale with coffee added to boost flavor. While stouts and porters are popular base styles for coffee beer, many craft breweries are experimenting with other styles, like cream ales and India pale ales. Brewers may steep the beans in either water or beer to impart java flavor without adding acidity. Barrel-aged or wood-influenced versions may show signs of oxidation, including sherry notes and other advanced flavors.