Sole with stock

4 tablespoons butter , Divided 2 tablespoons olive oil 3 tablespoons flour 2 cups fish stock or 2 cups chicken stock 1 cup mushroom , sliced 1/2 cup celery ,[...]

2 leeks , washed and sliced 1/4 cup butter 4 cups fresh spinach , chopped 1/4 cup white wine 1/2 cup chicken stock 1 cup 15% cream 6 potatoes , peeled and[...]