PERCH À L'ALLEMANDE
Put two large cleaned perch into a saucepan with two chopped carrots, a sprig of parsley, a celery root, a sliced onion and a pinch of salt. Cover with white wine and simmer for twenty minutes. Drain and keep warm. Take out the onion, parsley and celery root, add half a cupful of chopped mushrooms, and cook for five minutes. Cook with a tablespoonful each of butter and flour thickened together, take from the fire, add a tablespoonful of butter and the juice of two lemons. Pour over the fish and serve.