It is absolutely possible to make a stout with lager yeast. In fact, using lager yeast in a stout can result in a unique and flavorful beer that combines the smoothness and clean fermentation characteristics of a lager with the rich and roasted flavors typically found in a stout.
Traditionally, stouts are brewed with ale yeast, specifically strains that are known for producing complex flavors and aromas. These yeasts are top-fermenting, meaning they rise to the top of the fermentation vessel during fermentation. They typically ferment at warmer temperatures than lager yeast, which is bottom-fermenting and prefers cooler temperatures.
However, brewers have been experimenting with using lager yeast in different beer styles, including stouts, to create interesting and distinctive flavor profiles. The use of lager yeast in a stout can result in a beer that is cleaner and crisper in flavor, with a smoother mouthfeel compared to stouts brewed with ale yeast.
One example of a beer style that combines lager yeast with a stout is the Baltic Porter. Baltic Porters are typically brewed with lager yeast and exhibit characteristics of both porters and lagers. They are known for their rich, dark malt flavors, smooth mouthfeel, and clean finish. The use of lager yeast in this style allows for a more restrained yeast character, allowing the malt flavors to shine through.
I have had the pleasure of trying a coffee Porter brewed with lager yeast at a local brewery, and it was a truly enjoyable experience. The beer had a deep, dark color with a tan head that lingered throughout the glass. The aroma was a beautiful mix of roasted coffee beans, dark chocolate, and a hint of caramel. Upon taking a sip, the smoothness of the lager yeast was immediately noticeable, providing a clean and crisp backdrop for the rich flavors of coffee and chocolate to shine. The mouthfeel was velvety and full-bodied, with a pleasant lingering bitterness.
While using lager yeast in a stout may not be the traditional approach, it offers a unique twist on the style and can result in a delicious and complex beer. Brewers are constantly pushing the boundaries and experimenting with different yeast strains to create innovative and exciting flavors. So, if you come across a stout brewed with lager yeast, I highly recommend giving it a try and experiencing the interesting combination of flavors and characteristics that it offers.