Try this Italian Fruit Syrups, Part I recipe, or contribute your own.
Using a plastic bowl instead of a glass, ceramic, or stainless steel vessel during the initial room-temperature stage introduces micro-scratches that harbor unwanted bacteria, ruining the fermentation process before it begins. Active dry yeast requires precise environmental conditions to convert sugars into alcohol and carbon dioxide without spoiling the delicate fruit integrity. Metal reactivity is another hidden trap, meaning any contact with reactive aluminum will impart a metallic taste to the finished syrup. When straining the fermented mash after three to four days, cheesecloth folded into three or four thicknesses is mandatory; substituting a standard kitchen colander alone lets sediment pass straight into the collection pan. Twisting the cheesecloth firmly extracts every drop of liquid, leaving behind a dry pulp packed with spent yeast and fruit solids. Temperature stability matters immensely here, as ambient room conditions staying near 70 degrees Fahrenheit ensure the yeast remains active without overheating the puree.