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===Multi-Stage Fermentation===
[[File:Fast Sour Graph.jpg|thumb|upright=2.5|Conceptual graph of Fast Souring microbe and media dynamics|Conceptual graph of fast souring microbe and media dynamics. Y-axis for each microbe group depicts relative activity which combines in a conceptual sense: growth, acidification of wort, attenuation and production of flavor compounds. Plot drawn by Drew Wham based on concepts discussed in American Sour Beer <ref> Tonsmeire, M. (2014). American Sour Beers. Brewers Publications </ref> and Wild Brews <ref> Sparrow, J. (2005). Wild Brews: Beer Beyond the Influence of Brewer's Yeast. Brewers Publications</ref> . ]]
Matt Miller outlines a ''"three stage fermentation'' " process on his blog article [http://sourbeerblog.com/understanding-brewing-blending-lambic-style-kriek/ Understanding, Brewing, and Blending a Lambic Style Kriek] <ref>[http://sourbeerblog.com/understanding-brewing-blending-lambic-style-kriek/ Understanding, Brewing, and Blending a Lambic Style Kriek. Miller, Matt. Retrieved 1/24/2015.]</ref>. See the article for a much more detailed process. Matt was also interviewed about his process by James Spencer on the [http://traffic.libsyn.com/basicbrewing/bbr01-22-153stepkriek.mp3 BasicBrewing Radio podcast]. In summary, his process is as follows:
# Produce a low hopped wort (see the [[Mixed_Fermentation#Standard_Method|Standard Method]] above).
# After boiling the wort, cool it to 110-120°F (43.3-48.9°C), and run it into the fermenter.