Which of the following is an example of a Lambic beer?

Lambic beer is a traditional Belgian beer that is notable for its unique brewing process, which relies on spontaneous fermentation. This means that Lambics are fermented using wild yeasts and bacteria that are present in the environment rather than with a cultivated yeast strain. This fermentation process allows for a wide range of flavors, making Lambics distinct and often complex in taste.

Cantillon Lambic is a prime example of this style, produced by the Cantillon Brewery in Brussels, renowned for its commitment to traditional methods and for exemplifying the characteristics of Lambics. The beer typically exhibits sour and funky notes, often with additional fruits added during fermentation, enhancing its complexity.

In contrast, the other options do not fit into the Lambic category. Duchesse de Burgogne is a Flanders Red Ale, characterized by its maltiness and fruity sourness, but it is not a Lambic. Anchor Old Foghorn is an English-barley wine with a different fermentation method and flavor profile. Pohjala Porridge Bullet, while innovative, is a modern craft beer and does not adhere to the traditional Lambic brewing techniques.

Thus, Cantillon Lambic stands out as the sole true representation of a Lambic beer among the provided options.