Made from Prato Lungo olives from the oldest grove in Napa Valley, the proximity of our mill to the grove and our milling methods are the perfect recipe for extra virgin olive oil with extremely low acidity and a silky smooth mouthfeel. This unique combination reinforces the Prato Lungo Organic Extra Virgin Olive Oil as the king of our finishing oils. 375ml. Certified by COOC & CCOF Purchasing olive oil with the California Olive Oil Council (COOC) Seal means you are buying fresh, California-grown, 100% extra virgin olive oil — the healthiest and most delicious olive oil on the market today. The certification process includes two tests: lab analysis with parameters indicating careful handling and storage of the olives and the oil, and a blind taste test by certified tasters. Only after the oil has passed both tests does it earn the right to display the COOC Seal. California Certified Organic Farmers (CCOF) is the organic certifying agency.