French Onion Soup

 French Onion Soup

 4 Servings | 15-minute Prep Time | 12-hour and 30-minute Cook Time | Overnight Rest Time

Ingredients

For Stock:

2 lbs. Beef Marrow Bones (femur, tibia, shank bones), ask your butcher to cut them into 4-5 inch pieces
2 Yellow Onions, peeled quartered
3 Carrots, peeled and quartered
2 Celery Ribs, quartered
3 Garlic Cloves
1 tsp. Whole Black Peppercorns
1 Bay Leaf
3-5 Fresh Thyme Sprigs

For Finishing Soup:

3 lbs. Yellow Onions, thinly sliced
7 oz. Cipollini Onions
3 Tbsp. Duck Fat
3 Tbsp. Butter
5 c. Homemade Beef Stock (see above)
½ c. White Wine Vinegar or Dry White Wine
2 Sprigs of Fresh Thyme
2 Bay Leaves
1 Garlic Clove
2 c. Shredded Gruyère Cheese
French Bread/Baguette
Salt and Pepper

Instructions

For Stock:

Preheat oven to 400°F.

Wash the bones thoroughly.

Place bones, yellow onions, and carrots on baking sheet. Roast for 30-40 minutes, turning halfway through, until they start to brown (pay attention to any odd angles of bones, do not let them burn).

Remove the baking sheet from the oven.

Place onions and carrots in a dish for later use, set in refrigerator to stop cooking process.

Place bones in 3-quart pot, fill pot with cool water until the bones are covered by about 1 ½ inches of liquid. Cover pot with lid. Bring to slow simmer over medium heat, ideally over a precision simmer burner. Drop heat immediately as simmer starts.

Bare simmer bones for 6 hours. Use instant-read thermometer to monitor temperature every hour. Temperature should be at 180°F as consistently as possible. Do not let it get below 179°F or above 190°F, as marrow bones contain more collagen than typical stock bones and these temperatures can produce undesired, fatty, results.  Do not stir the stock. Do not shake the stock. Do not bump the stock. Do not move the stock. Delicately skim any fat off the top of the stock but do your best not to move the liquid too much.

*The stock should remain clear – you should be able to see the bottom of the pot through the stock the entire time. This stock will not become dark like store-bought beef stocks that contain molasses, tomato paste, or other added ingredients that darken the color.  The final color of this stock will be closer in resemblance to chicken stock. *

After 6 hours, add the mirepoix and continue to bare simmer for 1 hour. Delicately skim as needed.

Add bouquet ingredients (garlic, peppercorns, bay leaf, thyme sprigs) – don’t worry about tying them up in cloth, everything is getting strained later. Continue to bare simmer for 1 more hour. Again, delicately skim as needed.

*Salt is missing from this stock on purpose. (Consider the way unsalted/salted butter is sold.) Add salt as necessary to season when you are using this stock in recipes, so you have greater control over the final product. Store-bought stocks generally have too much salt and you can’t control the content properly. *

Remove from heat and cool over an ice bath, stirring frequently. Strain solids.

Place the stock in a covered container in the refrigerator overnight. Skim any solidified fat from the top in the morning.

For Finishing Soup:

Preheat two cast iron skillets over medium-high heat.

Add 2 tablespoons of duck fat and 2 tablespoons of butter to preheated pans.

Add onions to pan, soften over medium-high heat, about 5-7 minutes.

Lower heat to medium-low and caramelize onions, stirring frequently, about 1-3 hours. Keep checking and stirring as you start to prepare the other ingredients.

Preheat oven to 375°F.

Bring a small pot of water to boil, add cipollini onions and blanch them for 2-3 minutes.

Drain cipollini onions. Remove peels.

Preheat oven-safe frying pan over medium-high heat with 1 tablespoon of duck fat and 1 tablespoon of butter.

Add cipollini onions to preheated frying pan, moving frequently, until brown on all sides. Season with salt and pepper.

Place the frying pan with the cipollini onions in preheated oven for 10 minutes, or until you can easily pierce the cipollini onions with a paring knife. 

Remove onions from the oven, set aside for later use.

Bump even temperature up to 400°F.

Toast bread in oven for 5 minutes. Remove and slice into 8-12 slices (depending on size, account for the size of your serving soup bowls). Set aside for later use. 

Combine the caramelized yellow onions into one cast iron pan.

Add white wine vinegar (or dry white wine) to the yellow onions, bring to a simmer and scrape the bottom of the pan. Cook for 10 minutes, or until the alcohol/vinegar smell is gone.

Transfer the yellow onion mixture to a 3-quart pot. Add 5 cups of homemade beef stock, thyme, and bay leaves.  Bring to a simmer over medium-heat, then half-cover the pot with a lid and reduce heat to medium-low.  Simmer for 20 minutes.

Preheat the boiler to high.

Rub garlic clove on toast slices.

Place 1-2 toast slices (depending on size)  in each of four oven-safe serving soup bowls. Cover with broth from soup, top each with ¼ cup of Gruyère cheese, then top with onions from soup and more broth until almost full. Use the onions to weigh down the bottom slice of toast. Add 3-4 cipollini onions to each bowl. Use last slices of toast on top, then top each bowl with another ¼ cup of Gruyère cheese. Place bowls on baking sheet, then broil until cheese is melted and starts to brown.

Serve immediately. 




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