It is said that some things improve with age. When it comes to Panther Coffee's cold brew (12-ounce, $3.50; 16-ounce, $4.50 ), time is certainly a good thing. The coffeehouse's espresso blend is steeped overnight at room temperature and made with filtered water. After the grounds are removed, the result is a caffeinated drink that is free of fatty acids or bitter oils — you know, those unpleasant flavors released in hot-extraction methods. Since these acids and oils are soluble at high heat, most hot-brewed coffee needs mellowing out with milk or cream. Cold-water brewing, on the other hand, results in a peerless, balanced cup. Panther Coffee's cold brew is nice and smooth. You won't even miss the milk.