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Mussels in a Boréale Noire Sauce au Gratin
341 ml (1 bottle) Boréale Noire beer 2 stalks celery, diced 1 leek (white part only), sliced 1 carrot, diced 1 small onion, diced To taste pepper 1 kg (1 bag) mussels, washed and cleaned 15 g (1 tbsp) all-purpose flou...
Moules