Creamy Caramelized-Onion Soup

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Ingredients
6  tablespoons unsalted butter    
1 1/4   pounds leeks (3 to 4), white and pale-green parts only, rinsed well and coarsely chopped    
5   cloves garlic, thinly sliced    
7  large shallots (about 14 ounces), thinly sliced    
2  large Vidalia onions (about 20 ounces each), cut into 1/4-inch-thick slices    
3/4   cup dry white vermouth    
4  cups homemade or low-sodium store-bought chicken stock 
Coarse salt    
1   cup heavy cream
 
Directions
1.   Melt 4 tablespoons butter in a large saucepan over medium heat. Add leeks, garlic, shallots, and half of the onions. Cook, stirring occasionally, until vegetables are very soft and translucent, about 10 minutes. Reduce the heat to medium-low, and cook, stirring occasionally, until vegetables are deep golden brown, about 25 minutes.
   
2.   Add vermouth, stock, and 1 teaspoon salt. Bring to a boil. Reduce heat to medium-low. Simmer, stirring occasionally, 15 minutes. Let cool. Purée onion mixture in batches in a blender until smooth, about 3 minutes per batch. Set aside. 
  
3.   Meanwhile, melt remaining 2 tablespoons butter in a medium skillet over medium-low heat. Add remaining onion. Cook, stirring occasionally, until onion is very soft and golden brown, about 45 minutes. Cover, and set aside.
   
4.   Return onion purée to saucepan. Stir in cream. Reheat over medium heat, stirring, until heated through but not boiling. Season with salt, if desired. Serve, topped with caramelized onions.  
Serves 6 to 8.


Source:  www.marthastewart.com
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