
Steam Les Cultures de chez nous sliced leeks for 5 minutes.
In a casserole, set the butter, add flour until well mixed with butter, and add the milk and 1/4 of Gruyère cheese (about 45 ml or 3 tablespoons).
Set sliced leeks at the bottom and cover with béchamel sauce. Spread with Gruyère cheese left. Oven bake at 400°F (200°C) for 20 minutes.

Leeks contain large quantities of vitamins A, B1, B2, B3, B9 (folic acid) and C.
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