Spinach and feta triangles are a delicious appetizer made with phyllo pastry. They are small triangular pastries filled with a mixture of spinach, feta cheese, onions, and herbs. The phyllo pastry is folded into a triangle shape and baked until golden and crispy. Spinach and feta triangles are often served as a party snack or as part of a mezze platter. They are a flavorful and satisfying appetizer that is loved by many.