Certified Cicerone key terms

A glass free of grease, detergent film, lint, and dried foam residue, so beer foam can cling and aromas read clearly. A properly clean glass shows lacing and no bubbles stuck to the inside walls.

Matching dispense gas pressure to the total resistance created by beer line length, line diameter, and elevation lift, so beer pours at its intended carbonation with a proper head and little foam waste.

A foam-on-beer detector fitted to a draught system that halts beer flow when a keg empties and foam arrives, stopping foam from being pushed into the lines and poured as waste.

The fitting that locks onto a keg valve and connects it to the gas and beer lines. Common types include D-system (Sankey) and S-system, which are not interchangeable between kegs.

A mixture of nitrogen and carbon dioxide, typically 70/30 or 75/25, used to dispense stout and similar beers at higher pressure without overcarbonating them, giving a creamy, tight, long-lasting head.

Scheduled flushing of draught beer lines with caustic and acid cleaners to remove beer stone, yeast, and bacteria that cause off-flavors, foaming problems, and shortened keg life.

The temperature range at which a beer shows its best balance of aroma, carbonation, and flavor, ranging from roughly 38–45°F for light lagers up to 50–55°F for strong ales.

A pale, delicately fruity top-fermented ale from Cologne, Germany, that is lagered after fermentation. It is crisp and lightly hopped, traditionally served in narrow 0.2-liter Stangen glasses.

A copper-colored, top-fermented German ale from Düsseldorf that is cold-lagered to smooth it. It balances malt richness with firm hop bitterness and finishes dry and clean.

A very pale, low-alcohol German wheat ale from Berlin fermented with ale yeast and lactic acid bacteria. It is sharply tart and highly carbonated, traditionally served with a shot of fruit syrup.

A Belgian wheat ale brewed with unmalted wheat and spiced with coriander and orange peel. It is hazy pale, refreshing, and lightly tart, with a spicy-citrus aroma and soft body.

A Belgian farmhouse ale, historically brewed in winter for summer drinking. It is highly carbonated, dry, and fruity-spicy, often with earthy hop character and a peppery finish.

A traditional Belgian blend of young and aged lambics that referments in the bottle, producing a dry, sharply acidic, funky beer with champagne-like carbonation and complex Brettanomyces character.

A West Flanders sour ale aged in oak with mixed cultures. It is deep red, wine-like, and moderately sour, with notes of vinegar, red fruit, and vanilla.

A German beer, classically from Bamberg, brewed with malt kilned over beechwood smoke. It shows a distinct smoky, bacon-like aroma layered over a malty lager base.

A strong, dark German lager originally brewed by monks as liquid bread. It is rich with toasted bread, caramel, and dried fruit, low in hop bitterness, and high in alcohol.

A pale golden Czech lager made with soft, low-mineral water, decoction mashing, and Saaz hops. It is malty and round with a distinct spicy hop aroma and clean bitterness.

A buttery, butterscotch-flavored compound produced by yeast, especially when fermentation is rushed or the beer is not properly matured. In most styles it is a fault; light traces suit some English ales.

A green-apple or fresh-cut pumpkin aroma caused by yeast not completing its conversion of acetaldehyde to ethanol, often through early packaging, cold fermentation, or oxygen pickup.

A cooked-vegetable or creamed-corn aroma that comes from malt and from bacterial contamination. Low levels are normal in pale lagers, but it is considered a fault in most ales.

Aromatic compounds formed during fermentation from yeast activity and alcohol reactions. They give fruity notes such as banana, pear, and apple, welcome in some ales but unwanted in lagers.

Aromatic compounds that smell spicy, clove-like, medicinal, or smoky. Yeast, wild microbes, or phenolic off-flavor contamination produce them; some are desirable in wheat beers and Belgian styles.

A skunky, sulfurous aroma created when ultraviolet light breaks down hop-derived iso-alpha acids, forming 3-methyl-2-butene-1-thiol. Brown glass and cans protect beer from this reaction.

Staling caused by oxygen pickup that produces papery, cardboardy, or sherry-like notes from compounds such as trans-2-nonenal. It also dulls hop aroma and darkens beer color over time.

A drying, puckering, rough sensation in the mouth caused by tannins, often extracted from grain husks through overmilling, overly hot sparge water, or prolonged contact with hops.

Perceived bitterness from isomerized hop acids, measured in International Bitterness Units. IBU shows concentration, but malt sweetness, carbonation, and alcohol change how bitter a beer actually tastes.

A mash step held around 148–158°F at which enzymes convert malt starch into fermentable sugars. The rest temperature controls the balance of fermentability, body, and final alcohol.

A traditional mashing method in which part of the mash is removed, boiled, and returned to raise the temperature in steps. It adds malt depth and is common in German and Czech lagers.

Rinsing the drained grain bed with hot water to recover sugars left after the mash. Water that is too hot or excessive sparging can extract harsh, astringent tannins.

The conversion of hop alpha acids into iso-alpha acids during a rolling boil, which is what makes beer bitter. Longer boils increase bitterness but boil off volatile aroma oils.

Adding hops after fermentation, usually at cool temperatures, to build aroma without adding bitterness. It contributes fresh herbal, citrusy, or resinous notes that would be lost if boiled.

The tendency of yeast cells to clump together and settle out once fermentation ends. Highly flocculant strains clear quickly and may leave residual sweetness; poorly flocculant strains leave hazy beer.

The share of sugars a yeast converts into alcohol and carbon dioxide. High attenuation gives dry, lighter-bodied beer; low attenuation leaves residual sweetness, more body, and lower alcohol.

Any fermentable source other than malted barley, such as rice, corn, wheat, or sugar. Adjuncts lighten body and color and are used widely in lager brewing and strong Belgian styles.

Cold storage of beer at roughly 32–40°F for weeks or months after fermentation. It settles yeast and proteins, smooths harsh flavors, and develops the clean character expected of lager styles.

Matching a beer and a food that share flavor notes, such as a chocolate stout with a chocolate dessert. Shared characteristics reinforce each other so both taste fuller and more intense.

Deliberately pairing opposites, such as a bitter IPA with sweet fatty food or a tart sour beer with rich cheese. The tension refreshes the palate and stops rich food from becoming tiring.

Using carbonation, acidity, or bitterness in a beer to strip fat, sweetness, and salt from the tongue between bites, so each mouthful of food tastes fresh rather than heavy.

Balancing the strength of a beer against the strength of a dish so neither overwhelms the other. Delicate fish calls for a light lager; an assertive curry needs a hoppy or strong dark beer.

A flavor or ingredient present in both the beer and the dish, such as coriander in a witbier and in a spiced recipe, which links the two and makes the pairing feel intentional.