Eisbocks are made from which process?

• A. Freeze concentration
• B. Distillation
• C. Filtration
• D. Fermentation

Answer: (A)

Eisbocks are made by freeze concentration: you partially freeze the beer and remove the ice that forms. Taking out the water as ice leaves a smaller amount of liquid that's richer in sugars, flavors, and alcohol, giving a much higher ABV without boiling. This is different from distillation, which uses heat to vaporize and separate components; eisbocks don’t rely on boiling and collecting vapors. Filtration simply clarifies and doesn’t increase concentration, and fermentation is the biological step that creates alcohol from sugars, not the process that concentrates an already brewed beer.