This combines the greatness that is French onion soup with French dips. It is not supposed to be an 'authentic' French dip recipe, because authentic is often boring. These are yummy sandwiches for those that like roast beef and French onion soup. It is mainly on the slow cooker, but it requires a bit of prep on the stove, too.

Recipe Summary

40 mins
7 hrs 11 mins
7 hrs 51 mins
8 sandwiches


Original recipe yields 8 servings
The ingredient list now reflects the servings specified
Ingredient Checklist


Instructions Checklist
  • Heat 3 tablespoons olive oil over medium heat in a large, deep pot. Add onions and toss to coat with oil. Cook, stirring often, until softened, about 15 minutes. Add 1 tablespoon butter. Cook and stir until onions start to brown, about 15 minutes more.

  • Stir sugar and 1/2 teaspoon salt into the onions in the pot. Continue to cook, stirring once halfway through, until onions are well-browned, 10 to 15 minutes more. Mix in garlic and cook for 1 minute more.

  • Stir 3 tablespoons of water into the pot, scraping bits from the bottom. Let simmer for 3 minutes; repeat with an additional 3 tablespoons water. Simmer for 3 minutes more and repeat. Add vermouth; scrape bits from the bottom and sides of the pot. Cook for 4 minutes more. Add stock, Worcestershire sauce, soy sauce, thyme, and bay leaf. Simmer for 10 minutes; do not boil. Add black pepper. Discard bay leaf. Remove pot from heat and allow soup to cool. Pour into the slow cooker, but don't turn it on.

  • Trim any excess fat from the rump roast. Sprinkle all sides with salt and pepper. Heat remaining 2 tablespoons olive oil in the pot over high heat. Cook the meat, holding it down with tongs, until browned on all sides, about 10 minutes. Transfer meat carefully to the slow cooker. Spoon the soup over the meat so that it is topped with a few onions. Cover and cook on Low for 4 hours.

  • Remove meat from the slow cooker. Slice it diagonally and return slices to the slow cooker. Continue to cook on Low for 2 hours more.

  • Preheat the oven to 350 degrees F (175 degrees C). Spread rolls with remaining 2 tablespoons butter; place face-down on a baking sheet.

  • Bake rolls in the preheated oven until beginning to brown, 8 to 10 minutes. Remove from the oven, flip, and sprinkle with Gruyere cheese. Set oven rack about 6 inches from the heat source and turn on the oven's broiler. Broil rolls until cheese is slightly bubbly and lightly browned, 2 to 4 minutes.

  • Remove meat from the slow cooker using a slotted spoon. Place on the rolls. Serve soup on the side for dipping.

Cook's Notes:

Trip-tip roast also works in this recipe.

I used a mix of white and yellow onions.

White wine or sherry can be substituted for the vermouth if desired.

Nutrition Facts

615 calories; protein 42.2g; carbohydrates 34.1g; fat 33.5g; cholesterol 110.1mg; sodium 785.5mg. Full Nutrition

Reviews (28)

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Most helpful positive review

Rating: 4 stars
I didn't bother with the fry pan. I just put the butter and sliced onions in crock pot and let them cook until they were soft just like I would do for onion soup. Saves time and extra pans Read More
35 Ratings
  • 5 star values: 27
  • 4 star values: 7
  • 3 star values: 0
  • 2 star values: 1
  • 1 star values: 0
Rating: 4 stars
I didn't bother with the fry pan. I just put the butter and sliced onions in crock pot and let them cook until they were soft just like I would do for onion soup. Saves time and extra pans Read More
Rating: 5 stars
Great recipe! Delicious! I browned the meat in a frying pan first and then cooked the onions in the same pan. It seems to be a more natural order of events. Read More
Rating: 5 stars
Excellent recipe! Recommend making it when you have about an hour in the morning for prep, but it is so worth it! Read More
Rating: 5 stars
This recipe turned out great! I admit I was worried at the 4 hour mark by how tough the rump roast was when I took it out to slice it diagonally , but it was falling apart at 6 hours. Plus, I had never carmelized onions before but it was really worth the effort . Toasting the buttered rolls before adding the cheese and then putting them under the broiler gave the rolls the heft necessary to stay in one piece when dipped in the soup. My husband requested this recipe after he saw it in an email from All Recipes. I was initially reluctant because I don't like lots of sliced onions in recipes but caramelizing the onions made all the difference. I wanted to eat them with a spoon! My husband and I both really liked this recipe. The only thing I did differently from the recipe was that I used 14 oz of beef broth and 6 oz of chicken broth because I did not have any more beef broth. It came out fine with that substitution. This recipe is a keeper! Read More
Rating: 5 stars
Absolutely worth the prep! Carmelizing the onions, then making sure I took up the dripping with it was the kicker!! I did it for Sunday dinner, also, and everyone was clamoring for seconds. Served it with a potato salad and fresh spinach salad. EXCELLENT! Read More
Rating: 5 stars
This was great for my family with simple prep on a busy Sunday afternoon. Absolutely delicious! I threw in a few extra onions mushrooms and carrots just b/c the beef seasoning stews them up so nice. That was just an added bonus. ENJOY!! Read More
Rating: 5 stars
Great! Did not have a ouija board to serve it on so used a monopoly board instead....;) really is a good recipe Read More
Rating: 5 stars
Followed exactly but used a tri tip instead. So good! Read More
Rating: 5 stars
My entire family LOVED this sandwich! Making it again today. Read More