The artisan cheese traditionally used in Greek salads is feta cheese. This cheese is made from sheep's milk or a combination of sheep and goat's milk, giving it a creamy texture and a tangy flavor that complements the fresh ingredients of Greek salads. Feta is often sold in blocks or crumbled and can be stored in brine to enhance its flavor. In a classic Greek salad, feta is typically combined with tomatoes, cucumbers, olives, red onions, and a drizzle of olive oil, creating a refreshing and nutritious dish that reflects Mediterranean culinary traditions.