Recipe

Traditional French onion soup the slow-cooker way

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Traditional French onion soup the slow-cooker way
  • This recipe was entered in the contest for Your Best Onion or Garlic Soup
  • Chef

    ody's Notes: This soup comes from trial and error, with some inspiration from Julia Child and Nigella Lawson. The amounts are all approximate---you can adjust as you see fit. I make this whenever beef...

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Makes 6 quarts

  1. Line bottom of slow cooker crock with one layer of solid onion slices (i.e. slice the onions into 1/4 inch discs but don't separate the layers).

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  2. Sprinkle garlic, thyme, peppercorns, and bay leaves over onions.

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  3. Lay beef ribs on top of everything else (leave some space between each rib) and generously sprinkle with salt.

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  4. Put the lid on the slow cooker and set it to "high"; cook for 3-4 hours.

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  5. Add water to within 1 inch of top of crock (adding water that's already hot will speed cooking time); cook another 4-8 hours (the longer it cooks, the tastier the broth will be).

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  6. Skim fat (or use for croutons gratinés: see below) and add the ground pepper, if using, and Braggs to taste. (I highly recommend the richness of Braggs, but you can also substitute 1 tsp soy sauce or 2 tsps kosher salt, or more to taste.)

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  7. For hearty, chunky soup: fish out rib bones and as many bay leaves as you can find. For more refined soup: strain broth, recovering as much of the meat and garlic as you can pick out.

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  1. Put butter in a large, heavy skillet over medium heat until just melted.

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  2. Stir in onions and thyme.

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  3. Set kitchen timer to 8 minutes. Leave the kitchen, returning every 8 minutes to stir the onions, until they've started to caramelize. This should take 45 minutes to an hour: if you get brown patches in your skillet in the first 30 minutes of cooking, turn the heat down. After the onions start caramelizing (at or beyond the 45-minute mark), you may wish to cook them an extra 10-15 minutes, stirring more frequently (every 1-2 minutes), for a sweeter caramel flavor.

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  4. Once onions are cooked to your taste, turn off the heat and deglaze the pan with a ladleful of broth.

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  5. Make the croutons: Preheat oven to 400 degrees. Line a baking sheet with foil.

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  6. Slice bread and cheese. (I like 1/2 inch slices of bread and 1/8 inch slices of cheese, but it's really up to you.)

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  7. (Optional) paint bread with extra fat from broth. I dip my brush into the fat that's floating in the crock, and then stir any remaining fat right back into the soup.

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  8. Arrange fat-brushed bread cut side down on foil-lined baking sheet and bake for 3-5 minutes, until bread is nicely browned. (The browner it gets, the crispier it'll stay once it gets into the soup.)

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  9. Pull sheet out of oven, flip pieces of bread, and lay a slice of cheese on each piece.

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  10. Bake for another 5-10 minutes, until cheese is fully melted and just beginning to brown. Remove from oven.

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  11. Put it all together: Add onions to crock or broth to skillet, whichever makes the most sense in your kitchen. Put 1 or 2 croutons in each bowl and ladle in the soup. Serve with a big green salad.

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5 Comments on Traditional French onion soup the slow-cooker way

New_years_kitchen_hlc_only Reply

P.S. The idea of brushing the bread with the beef fat is brilliant. I can't think of a better way to add a rich, gorgeous flavor in this context. Bravo!!

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Yay, I'm so glad you liked it---brushing the fat on the bread also makes it stay crunchier in the soup. Thanks for the detailed review!

New_years_kitchen_hlc_only Reply

For some reason, I can't reply directly to your question . . . the soup was terrific!! I used "English short ribs" and sweet Maui onions, and fresh thyme. Actually I used lemon thyme, because my bush is in a growth period now, and my regular thyme has been heavily used. I also added a couple tablespoons of Worcestershire sauce, because I love its taste with any beef/onion combination. The basic recipe is excellent, and could be used for a nice vegetable beef soup, a hearty minestrone, or a tasty beef and barley soup. Very well done, Ody!

New_years_kitchen_hlc_only Reply

Nice recipe! I plan to make this tomorrow. I especially appreciate all the tips, both in the introduction and throughout the recipe. Very nicely done. Thank you! ;o)

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Eugenia Bone

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