Mike brewed a peach mango kettle sour wheat beer for hot weather and shared his complete process. This batch combined a simple wheat beer base with heavy fruit additions and controlled lactic sourness. We tasted the finished beer and discussed its aroma, flavor, acidity, and performance using older brewing cultures.
Peach Mango Kettle Sour Wheat Beer Recipe
Batch Size: Approximately 3.5 gallons
Water Profile:
50 percent tap water
50 percent spring water
Slight emphasis on sulfate
Grain Bill:
50 percent Pilsner malt
50 percent white wheat malt
Hops:
20 grams Centennial hops at flameout
Yeast:
1 packet of Lallemand New England yeast
1 packet of Mangrove Jack’s Hophead yeast
Mash Schedule:
Mash at 152°F for 60 minutes
Kettle Souring Process:
Bring the wort briefly to a boil for sanitation
Cover the kettle and cool the wort to approximately 95°F
Pitch two 10-gram packages of Lallemand WildBrew Sour Pitch
Hold the wort between approximately 85°F and 95°F
Taste after 24 hours and continue souring when necessary
Sour for approximately 48 hours total
Boil again to stop the souring process
Continue boiling approximately 60 minutes to reach the target gravity
Fermentation:
Ferment for approximately ten days
Fruit Addition:
2 pounds frozen mangoes
2 pounds frozen peaches
Thaw the fruit completely
Blend the fruit into a puree
Press the puree through a fine strainer
Packaging:
Add the strained puree to a 2.5-gallon serving keg
Transfer the fermented sour beer directly over the puree
Chill and carbonate before serving
Additional Details:
After mashing, Mike briefly boiled the wort to sanitize it before beginning the kettle souring stage. He cooled the covered kettle to approximately 95°F, then pitched two packages of Lallemand WildBrew Sour Pitch. The culture had expired in 2023, so he doubled the pitch and allowed extra time for souring. After 24 hours, the wort tasted mildly sour, but another day produced a noticeably stronger lactic character.
Mike then boiled the wort again, stopping further acid production and preparing the beer for fermentation. At flameout, he added 20 grams of Centennial hops for citrus and orange peel character without meaningful bitterness. He fermented for roughly ten days using Lallemand New England yeast blended with Mangrove Jack’s Hophead yeast. Both yeast packages were approaching expiration, but fermentation started quickly and completed without any apparent problems.
For fruit, Mike thawed two pounds each of frozen mangoes and peaches before blending everything into puree. The mixture remained too pulpy for keg service, so he repeatedly blended and pressed it through a fine strainer. That effort produced a smooth fruit base while removing enough solids to reduce the risk of clogged fittings. He added the puree to a serving keg, then transferred the fermented sour beer directly over it.
After chilling and carbonating the keg, the beer was ready for our summer tasting session.
Tasting Notes and Learnings
The finished beer showed restrained sourness rather than an aggressively puckering acidity, making the fruit easier to evaluate. Mango dominated the aroma, including a slightly underripe or cucumber-like quality that became softer as the beer warmed. Peach remained in the background, while the combined fruit contributed additional acidity and a smooth nectar-like texture. The lactic character reminded us of yogurt, although it stayed balanced enough for a refreshing summer beer. I enjoyed the first glass, but the intense fruit and acidity made this better as an occasional pour. Mike found it especially refreshing during hot Fourth of July weather and considered trying another fruit combination.
This experiment showed that kettle souring can remain simple when temperature, tasting, and sanitation guide the process. The expired culture still worked effectively, although fresh bacteria would probably reach the desired acidity more quickly. An all-in-one brewing system could simplify this method by controlling temperature and limiting unnecessary transfers. However, the fruit preparation required patience because heavy puree additions can create practical challenges inside a keg. Overall, the beer delivered noticeable mango, softer peach, balanced lactic tartness, and the refreshing character Mike wanted.
BREW ON!