The difference between keg beer and cask ale lies in several key factors. Let's dive into each one to better understand the distinctions between these two popular beer options.
1. Filtration and Carbonation:
Keg beers undergo filtration, which helps remove any impurities and sediment, resulting in a clear and bright appearance. On the other hand, cask ales are unfiltered and often served with a slight haze, as they retain yeast and other natural particles. This gives cask ales a more rustic and traditional appeal.
Keg beers are also force-carbonated, meaning carbon dioxide (CO2) is added to the beer under pressure. This makes them fizzy and creates a consistent level of carbonation across each pour. In contrast, cask ales naturally carbonate through secondary fermentation in the cask, where a small amount of sugar is added to allow the remaining yeast to produce CO2. This results in a softer carbonation with finer bubbles, giving cask ales a smoother mouthfeel.
2. Temperature and Serving Method:
Keg beers are typically served colder than cask ales. The colder temperatures help to preserve the beer's freshness and extend its shelf life. When you order a keg beer, you'll often notice that the beer tap is connected to a refrigeration system, ensuring a consistently chilled product.
On the other hand, cask ales are traditionally served at a slightly warmer temperature, typically between 11-13°C (52-55°F). This allows for the complexities of flavors and aromas to be fully appreciated. Cask ales are typically stored in a cellar or cool room, allowing them to be served at a natural cellar temperature.
3. Dispensing Method:
The dispensing method for keg beers and cask ales also differs. Keg beers are typically dispensed using a gas-driven system, such as a CO2 or nitrogen gas blend. This gas pressure propels the beer from the keg to the tap, resulting in a steady and consistent flow. This method allows for greater control over the pouring process and ensures that each pint is served with the desired level of carbonation.
In contrast, cask ales are served using a hand pump or beer engine. This manual method requires the bartender to pull the beer through the line using a pump handle. This process imparts a natural and gentle carbonation to the beer, with the bartender adjusting the speed and force of the pour to achieve the desired result. It creates a unique experience, as the beer flows at a slightly slower pace, allowing the flavors to evolve in the glass.
Keg beers and cask ales differ in terms of filtration, carbonation, temperature, and dispensing method. Keg beers are filtered, force-carbonated, and served colder, while cask ales are unfiltered, naturally carbonated, and served at a slightly warmer temperature. The dispense systems for each also contribute to the overall experience, with keg beers being poured using a gas-driven system and cask ales being served using a hand pump. These differences in production and serving methods result in distinct characteristics and flavors for both keg beers and cask ales.