French onion soup

French onion soup

A classic French low-carb soup that tastes even better in the blustery seasons. The cold's got nothing on you with this luxurious but budget-friendly onion soup!

French onion soup

A classic French low-carb soup that tastes even better in the blustery seasons. The cold's got nothing on you with this luxurious but budget-friendly onion soup!
USMetric
4 servingservings

Ingredients

  • 1¾ lbs (5 cups) 800 g (1.2 liters) yellow onionyellow onions
  • 2 2 garlic clovegarlic cloves
  • 2 oz. 55 g butter
  • 1 tbsp 1 tbsp olive oil
  • 3 cups 700 ml water
  • 2 2 vegetable bouillon cubevegetable bouillon cubes
  • ¾ cup 180 ml white wine, dry
  • 1 1 bay leafbay leaves
  • 1 tbsp 1 tbsp dried sage
  • 1 tsp 1 tsp dried thyme
  • 1¼ cups (4¾ oz.) 300 ml (140 g) gruyère cheese, shredded
Mug bread
  • 1 tsp 1 tsp butter
  • 1 tbsp 1 tbsp almond flour
  • 1 tbsp 1 tbsp coconut flour
  • ¾ tsp ¾ tsp baking powder
  • 1 pinch 1 pinch salt
  • 1 1 eggeggs
  • 1 tbsp 1 tbsp heavy whipping cream
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Instructions

  1. Peel onion and garlic and slice thinly. Use a food processor or mandolin.
  2. Fry in butter and oil until soft for 5-10 minutes, without browning it too much. It should be golden but not burnt. Add water, bouillon, wine, and spices. Bring to a boil then let it simmer on reduced heat for 15-20 minutes. Salt and pepper to taste.
  3. For the mug bread, grease a large mug or glass dish with a flat bottom with butter.
  4. Mix together all dry ingredients in the mug with a fork or spoon. Crack in the egg and stir in the cream. Combine until smooth and make sure there are no lumps.
  5. Microwave on high (approximately 700 watts) for 2 minutes. Check if the bread is done in the middle – if not, microwave for a few more seconds.
  6. Let cool and remove from the mug. Slice in half and toast.
  7. Divide the onion soup in ovenproof bowls. Top with the bread pieces and shredded cheese. Gratinate at 410°F (210°C) with the grill function on for 5-7 minutes, until the cheese, has melted and got a nice golden color.

Tip

Feel free to mix different kinds of onions, the flavor will become even more exciting. Half of it could be yellow onions, then fill up the rest with red onions, shallots, white onions or leek. Use whatever you have at home!

Recommended special equipment

  • Food processor or mandolin
  • Microwave oven
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13 comments

  1. Janelle Marie Petrow
    How would alter the recipe for a crockpot?
    Reply: #2
  2. Kristin Parker Team Diet Doctor

    How would alter the recipe for a crockpot?

    This recipe has not been tested in the crock pot.

  3. Elizabeth Rand
    Instead of the water and boullion cube, can you use chicken or vegetable broth?
    Replies: #4, #9
  4. Kristin Parker Team Diet Doctor

    Instead of the water and boullion cube, can you use chicken or vegetable broth?

    Yes, that would be fine!

  5. Jennifer
    If you leave out the mug bread, how many carbs are in this soup? My husband loved this soup. So delicious :)
    Reply: #6
  6. Kristin Parker Team Diet Doctor

    If you leave out the mug bread, how many carbs are in this soup? My husband loved this soup. So delicious :)

    The mug bread is listed as a stand alone recipe at the link below and is 3g net carbs.
    https://www.dietdoctor.com/recipes/low-carb-mug-bread

  7. Beth Loft
    for those of us without a microwave cooking facility... I imagine that Cloud Bread, toasted to help it keep together, would do the job?
    Reply: #8
  8. Kristin Parker Team Diet Doctor

    for those of us without a microwave cooking facility... I imagine that Cloud Bread, toasted to help it keep together, would do the job?

    I am not sure the Cloud Bread would be the right texture from the mug bread. Here is the stand alone recipe for the mug bread which includes oven baking times and temperature.
    https://www.dietdoctor.com/recipes/low-carb-mug-bread

  9. Selina
    I just did it with Chicken. It was yummy!
  10. 1 comment removed
  11. Paula
    Is there any other cheese other than guryere that can be used
    Reply: #12
  12. darkhorse32
    I would think Provolone would be a good substitute. 1oz of provolone has 0.6g of carbohydrate.
  13. adibbens
    i'm not good cooking is there video how cook this?
    Reply: #14
  14. Kristin Parker Team Diet Doctor

    i'm not good cooking is there video how cook this?

    There is not currently a cooking video for this recipe.

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