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In a large pot, saute onion in the melted butter over low heat. Cook until onions are translucent. Do not brown.
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Slowly, add the flour and stir to make a blond roux.
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Slowly stir in beef stock and spices, then bring mixture to a boil.
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Reduce heat and simmer for about five minutes. If using wine, add one minute before mixture is removed from the heat.
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In a separate bowl, combine the cream and egg yolk. Add in a small amount of the soup.
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Slowly stir this mixture into the soup pot and mix well.
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In each serving bowl, place one slice of toasted french bread in the bottom. Then, sprinkle bread with romano cheese before ladling soup over the bread.
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Place a slice of mozzerella on top of the soup. Place dishes in the oven until cheese is bubbly and starting to brown.
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Serve and enjoy your homemade calcasieu soup!