What must be done when brewing fruit beers with Saccharomyces?

When brewing fruit beers with Saccharomyces, it is essential to break down the cell walls of the fruit. This process releases the sugars and flavors contained within the fruit, allowing the yeast to access these compounds more effectively during fermentation. The breakdown of cell walls can be achieved through techniques such as pureeing or crushing the fruit, which ensures that the sugars in the fruit can be readily fermented by the yeast, resulting in a more flavorful and balanced beer.

Other options do not provide the necessary steps for successful fermentation with fruit. For instance, activating the yeast on its own is a standard practice but does not directly pertain to the handling of fruit. Adding unprocessed fruit might limit the yeast's ability to extract sugars, while increasing the sugar content is not generally a necessary step in fruit beer brewing since the focus is on utilizing the natural sugars present in the fruit itself.