Spinach and feta triangles are a popular appetizer made with phyllo pastry. They are small, bite-sized pastries filled with a mixture of spinach, feta cheese, onions, and herbs. The phyllo pastry is folded into a triangle shape and then baked until golden and crispy. Spinach and feta triangles are a delicious and flavorful appetizer that can be enjoyed on their own or served with a dipping sauce. They are perfect for parties and gatherings.