method
1. Heat plenty of lightly salted water in a large saucepan.
2. Trim and rinse the beans and add to the boiling salted water to cook, uncovered, until they are tender but still crisp.
3. While the beans are cooking, make a bechamel sauce of pouring consistency; take off the heat and stir in the cheese. Drain the beans; spread out in a wide, shallow flameproof dish, pour the cheese sauce all over them, heat to a gentle boil and serve, sprinkled with the mint and parsley.
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