Spinach and feta triangles are a delicious appetizer made with phyllo pastry. They are small triangular pastries filled with a mixture of sautéed spinach, feta cheese, onions, and herbs. The phyllo pastry is layered with the spinach and feta filling and then folded into a triangle shape. The triangles are then baked until golden and crispy. Spinach and feta triangles are a popular dish in Mediterranean cuisine and are often served as part of a meze platter or as a party snack.