4:366:46How is Beer Made? - YouTubeYouTubeStart of suggested clipEnd of suggested clipThey use wild yeast with spontaneous mixed cultures to ferment at 18 degrees Celsius for two toMoreThey use wild yeast with spontaneous mixed cultures to ferment at 18 degrees Celsius for two to three weeks the beer is then filtered and fermentation continues.
The simplest approach to make a higher alcohol beer is to add more sugar during fermentation. During beer's fermentation process, yeast eats the sugar made from malted grain and then converts it into alcohol and CO2. If there is more available sugar, the yeast has more food to eat, which produces more alcohol.