Ricotta di pecora, or sheep milk ricotta, is produced in many Italian regions, and each cheese has a slightly different flavor. Sicilian ricotta is seasonal, the best one is made in the period from November till May when the ewes are feeding on new grass and produce the most milk, but due to very high demand, nowadays it is also produced during the warmer months, usually using a mixture of sheep's and cow's milk.
Ricotta di pecora technically isn't a cheese but a creamy curd made by reheating sheep's whey, a watery liquid that remains as a byproduct of cheesemaking – hence the name ricotta, which literary means re-cooked. A small quantity of sheep's milk can be added to whey in order to improve its softness and flavor - generally, sheep milk ricotta has a slightly richer flavor than the one made with cow milk.