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Add the leeks and continue to cook for 5 minutes, stirring, until the leeks have softened.
Stir in the beans and season with salt and pepper and cook the hash over a medium heat until a crust forms on the bottom. Stir the hash to let the mixture brown throughout.
Turn the hash over and pat down to form a cake. Cook until a crust forms on the bottom. Turn onto plates and serve.
posted by Mr Falafel