Cod makes a tasty filling for puff pastry, especially when it is sauteed with sweet corn, sliced leek, minced garlic, chopped onion, bean sprouts, and grated carrots for a modern twist on tradition, and which is then topped with sliced hard boiled eggs, cooked french fries, and olives. Be sure to drain the cod saute mixture well before placing on the puff pastry dough to keep it from turning soggy.