Vintner's Best Prosecco Fruit Base is a blend of white grape and other juice concentrates, corn syrup, malic acid, and natural flavor designed to make a fermentable base for prosecco wine blend at 18.9 Brix. The product is blended, pasteurized and can be stored at ambient temperature. Diammonium phosphate is added as a yeast nutrient. 5 Gallon Prosecco wine recipe with instructions is included.