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Serves 4
| Note from Suzanne: This soup is best when served
in stoneware or other oven safe bowls, because you can
then place the bowls on a cookie sheet under the broiler
for a minute or two and let the cheese get brown and bubbly.
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Slice the onions very thinly. Place a 5-quart stockpot over medium-high
heat. Add the olive oil and the onions.
After about 10 minutes, lower heat to medium low. Add salt and
pepper to taste, mustard seed, celery seed, and cracked pepper and
continue to saute the onions until carmelized to a deep golden brown,
another 20-25 minutes.
When the onions are a rich brown, add the beef stock, wine and
Worcestershire sauce. Turn the heat up to medium and cook for about
15 minutes. Preheat the broiler.
In the meantime, cut the stem off the portobella mushroom. Place
the mushroom on its side and slice into 4 thin pieces. Heat a large
skillet over medium high heat. Brush mushroom slices with olive
oil and place in skillet, cooking for a couple of minutes on each
side until lightly browned.
Ladle the soup into 4 oven safe bowls. Place a mushroom slice on
top and a slice of cheese. Place bowls on a cookie sheet and place
under the broiler until cheese gets brown and bubbly.
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