Bourbon is an alcoholic drink produced in the United States from corn, rye, wheat and malted barley. It is distilled and aged in oak barrels for at least two years, which gives it its amber color and its characteristic taste of pecan and vanilla nuts. Bourbon has an amber color and a characteristic taste of caramel and vanilla, which comes from its aging in oak barrels. It is often appreciated pure or with water or ice cubes, but is also used in many cocktails, such as Old Fashioned and Manhattan. To be considered bourbon, the drink must respect certain strict rules. It must be produced in the United States, being made from cereals, including at least 51 % corn, be distilled with an alcohol content of less than 160 proof (80 % alcohol), be aged in new oak barrels and Unbeatable, and be clogged with an alcohol content of at least 40 %.