In this task, you have to identify the named entities (NER) which are the ingredients required given its directions. Named entities are the names of the items without their quantity.

To make the filling, trim and wash the leeks., Cut the white and tender green parts into 1-inch circles., Melt 3 tablespoons of butter in a shallow pan., Add the leeks and let them cook gently for 3-4 minutes., Season with salt and pepper, then stir in the tomatoes and oregano., Continue cooking gently until the leeks are soft and most of the liquid has evaporated., Stir in the parsley., Let the mixture cool to room temperature., (You can prepare it several hours ahead of time if you like.), Preheat the oven to 400 degrees., Grease a 13-by-9-inch lasagna pan., Lightly
leeks, butter, salt, pepper, oregano, tomatoes, parsley, eggs, ricotta cheese, oil, pastry