Mike brought a Mexican style corn lager to this tasting, continuing our ongoing interest in brewing more lagers. His goal was a light, refreshing beer with the pale yellow appearance he enjoys in Modelo Especial.
For this batch, he combined Pilsner malt and flaked corn with a packet of CellarScience BAJA lager yeast. However, the fermentation stopped higher than expected, giving us something to discuss beyond the grain bill and hops.
We enjoyed drinking this beer, although we both found characteristics that kept it from reaching Mike’s original goal.
The Recipe, Brewing Process, and Tasting
Mike brewed a three-and-a-half-gallon batch, using light Munich malt alongside the Pilsner malt for some additional malt character. Meanwhile, Tettnang hops provided the bitterness, with a small late addition intended to contribute some floral, spicy aroma.
Mexican Style Corn Lager Recipe
Batch size: 3.5 gallons
Grain Bill
- 72% Pilsner malt
- 12% light Munich malt
- 4% Carapils
- 12% flaked corn
Hops
- Tettnang in the boil, targeting less than 20 IBUs
- Small Tettnang addition with 5 minutes remaining
- Hop weights and the first addition’s timing were not specified
Yeast
- 1 packet CellarScience BAJA lager yeast, identified as 12 grams
- Pitched dry without rehydration
Water and Additions
- Spring water
- Small gypsum addition, targeting approximately 50 ppm calcium
- Whirlfloc and approximately ¼ teaspoon yeast nutrient near the end of the boil
Mash and Fermentation Notes
- Presoak flaked corn for 15 minutes before adding the remaining grain
- Mash at 150°F for 90 minutes
- After fermentation stalled, warm to approximately 70–72°F and rouse the yeast
- Initial fermentation temperature and duration were not specified
Stats
- Original gravity: 1.052
- Final gravity: 1.018
- ABV%: 4.46
The Beer Notes
Before mashing, Mike soaked the flaked corn because he wondered whether it was fully hydrating during his usual process. However, he didn’t think that extra step made a noticeable difference this time, so it remains an experiment.
Despite the long mash, fermentation stopped at 1.018, and warming the beer and rousing the yeast didn’t help. That finishing gravity surprised us, although I didn’t think the beer drank as heavily as the number suggested.
In the glass, I liked the color, and the beer showed a light white head with nice lacing. On the nose, I picked up some fruitiness that reminded me of banana, while Mike suggested green apple.
Some of that fruitiness carried into the flavor, along with a slight slickness that we discussed toward the end. Mike described a subtle homebrew character, and we suspected fermentation stress without establishing exactly what caused it.
Underneath those characteristics, there was an enjoyable beer, and I would happily drink it despite the slight flaws.
What We Learned
For another attempt, Mike would pitch two packets of BAJA yeast and remove the Munich from the grain bill. He would also consider Hallertau hops, aiming for a paler beer with a lighter touch from the hopping.
The larger question is whether a bigger yeast pitch would help this recipe reach the finish he wanted. Mike has seen better results with two packets in other small batches, making that a worthwhile next experiment.
For me, this tasting showed how an enjoyable beer can still leave clear opportunities for improving the next batch. We liked drinking it, but a cleaner fermentation and drier finish would bring it closer to Mike’s target.
BREW ON!