The primary ingredient in a traditional Greek salad is tomatoes. A classic Greek salad, also known as "Horiatiki," typically consists of ripe tomatoes, cucumbers, green bell peppers, red onions, olives, and feta cheese, all dressed with olive oil and seasoned with oregano. The fresh and vibrant flavors reflect the Mediterranean diet's emphasis on fresh produce. This salad is not only a staple in Greek cuisine but is also enjoyed worldwide for its simplicity, health benefits, and delicious combination of ingredients.