FRENCH ONION SOUP WITH FOIE GRAS & GRUYERE

French onion soup is famous for its deep savory-sweet taste and a perfect pairing with creamy gruyere cheese. Here we’ve given it satisfactory eating improve by way of sneaking in wild porcini mushrooms for extra umami and foie gras for extra richness.
We used B grade foie gras on this recipe as it’s less expensive and its less sweet taste is first-rate with the large flavors in the soup. Of course, this recipe is likewise an extraordinary way to make use of leftover grade A foie gras, so that it will make it taste even better.


INGREDIENTS

Soup
1/4oz Dried Porcini Mushrooms
6 medium Yellow Onions
2 tbsp Unsalted Butter
1 tsp Kosher Salt
¼ tsp Black Pepper, freshly ground
2 tbsp Tomato Paste
1 cup Dry White Vermouth
1-quart Lowest Sodium Beef Stock or Bouillon
2 tbsp Brandy
1 tsp Sherry Vinegar
Foie Gras & Gruyere Topping
Four 1/2” thick slices of Artisan Bread
¼ cup B Grade Foie Gras (we used the trim from deveining the full liver – could substitute A grade)
Four 1 1/2oz (3/4” to 1” thick) slices of B grade Foie Gras, well chilled (could substitute A grade)
4oz Gruyere Cheese, finely grated
Plus: 4 Wide (3 ½”-4” wide) Ramekins

DIRECTIONS

 Make the Soup:
1 Rehydrate the porcini mushrooms in ½ cup boiling water (how to rehydrate mushrooms).
2 Mince the rehydrated mushrooms. Strain the soaking liquid & reserve it.
3 Peel the onions & thinly slice them lengthwise into ¼” thick half-moons.
4 Melt the 2 tbsp of butter in a deep stockpot over medium-low heat. Add the onions, pepper & salt, then slowly caramelize the slices, stirring occasionally (how to caramelize onions). If the onions begin to stick to the bottom, stir in up to ½ cup of water.
5 After about 15 minutes, when the onions start to brown, stir in the tomato paste. Continue to cook, stirring occasionally and adding water if necessary, until the onions turn a dark brown (about another 15-25 minutes).
6 Combine the porcini soaking liquid and the vermouth. Deglaze the onion pan with this mixture. Simmer until the liquid evaporates.
7 Add the beef stock/bouillon. Bring the liquid to a boil, then reduce the heat to a simmer. Simmer, with the lid off the pot, for a half-hour, stirring occasionally.
8 Stir in the brandy and sherry vinegar. Taste, and add additional salt if necessary (though leave it slightly less salty than you prefer to account for the saltiness of the gruyere).
 Make the Topping:
1 If it isn’t already soft enough to spread, use your knife to scrape the ¼ cup of foie gras into a paste. Spread it across the middle of the bread slices, leaving the edges bare.
2 Broil the bread slices, just until the bread is crisped.
3 Sear the foie slices in a dry pan over high heat, just until that side is browned. Flip each slice for just a few seconds, then immediately remove them from the pan.
Save the rendered fat for dressings (replacing the oil), roast potatoes, etc.

4 Ladle the soup into ramekins until it comes most of the way up to the top.
5 Put a piece of toast on each ramekin of soup. Top each piece with a slice of foie (seared-side up).
6 Sprinkle the remainder of the top of the ramekin (toast, soup, everything that isn’t foie) with the gruyere.
7 Broil each ramekin in the oven, just until the cheese melts. Serve.