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Keto French Onion Soup Recipe (Low-Carb) 🥣

Feyza Kırmacı
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Enjoy the cozy comfort of our Keto French Onion Soup, a low-carb and gluten-free version of the classic. It is rich with caramelized onions and savory meat stock with the perfect balance of spices. Easy to make, this delightful soup is destined to be a cherished addition to your culinary favorites.

Homemade keto French onion soup served in a bowl with a spoon.
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Preparation and cooking overview

Start with melting some clarified butter in a pot, then caramelize the onions until they're golden brown. Next, add a splash of vinegar to bring out the flavors, then pour in your stock and herbs. Let it all simmer together, filling your kitchen with a wonderful French cooking aroma. In about an hour and a half, you'll be ready to enjoy this cozy, delicious soup.

Chef's note

In our keto onion soup, we use dried thyme and parsley to add a gentle touch of herbs. Feel free to toss in a bay leaf or some rosemary if you're after a stronger herb flavor. Quick tip: pop the herbs in a tea bag, so you can easily take them out after cooking. This way, your soup stays smooth and hassle-free.

Explore our collection of keto soup recipes for more low-carb dishes that warm the soul!

  • Prep Time: 15 minutes
  • Cooking Time: 1 Hour 5 Minutes
  • Total Time: 1 Hour 20 Minutes
  • Difficulty Level: Easy
  • Recipe Makes 6 Servings

🥣 Ingredients for this keto French onion soup recipe

While onions take center stage in this recipe, here's a list of other simple ingredients you'll need to bring it all together:

  • 1.5 pounds onions, thinly sliced
  • 2 tablespoons clarified butter
  • 2 tablespoons wine vinegar
  • 6 cups warm chicken stock, or beef stock
  • 1-2 parsley stems
  • 1-2 sprigs fresh thyme
  • 1 garlic clove
  • Sea salt, to taste
  • Freshly cracked black pepper, to taste
All the ingredients required to make keto French gathered and arranged on that table.

Ingredient substitutions

Not a fan of certain ingredients? Try these swaps:

  • Chicken or beef stock: Swap regular chicken or beef stock with bone broth for added flavor depth.
  • Clarified butter: No clarified butter? Regular unsalted butter works just as well.
  • Wine vinegar: Replace wine vinegar with apple cider vinegar for a similar tang.

Additional ingredients

Enhance your soup's richness with these keto-friendly add-ins:

  • Bay leaves: A couple in the pot elevate the aroma.
  • Grated Swiss, Parmesan, or Gruyere cheese: A sprinkle of Parmesan, Gruyere, or Swiss cheese on top adds creaminess.
  • Bacon bits: For a smoky crunch, garnish with cooked bacon.
  • Chopped chives or green onions: Sprinkle on top for a fresh, mild flavor.
  • Sour cream or Greek yogurt: Stir in a dollop before serving for creamy tanginess.
Keto French onion soup in a bowl alongside a pot with the same soup.

Cooking tools required

To make this keto French onion soup, you'll need the following tools:

  • Measuring spoons and cups
  • Large pot
  • Knife
  • Cutting board
  • Wooden spatula

How to make Keto French Onion Soup: step-by-step guide

Cooking methods

  • Sautéing
  • Simmering

Preparation steps

  1. Gather and measure all the ingredients.
  2. Thinly slice the onions and peel a garlic clove.
  3. Put the parsley, thyme, and garlic clove in a tea bag.

Cooking instructions

  1. In a large pot, melt clarified or regular butter over medium heat.
  2. Add thinly sliced onions and cook for 25-30 minutes, stirring frequently, until deeply caramelized and brown.
  3. Once onions are caramelized, add vinegar and stir for a few minutes to intensify the flavors.
  4. Pour in warm chicken or beef stock. Add a teabag containing parsley stem, thyme sprig, and garlic clove.
  5. Bring to a simmer and cook for an additional 30-35 minutes.
  6. After cooking, take out the teabag with herbs.
  7. Season with sea salt and ground black pepper to taste.
  8. Ladle the soup into bowls. Optionally, top with keto-friendly bread and shredded cheese.

Chef's pro tip

Caramelizing onions can seem time-consuming, and you might want to speed up the process. However, patience is the key here. Stick to low and slow cooking. The extended caramelization time enriches the soup's flavor, which makes it deeper and more complex. Trust the process; the delicious outcome is well worth the wait.

What to serve with this keto French onion soup?

Wondering what to pair with this tasty French onion soup? Consider these side dishes:

  • Keto Bread: Swap out traditional bread for a slice of our low-carb version, lightly toasted, to complement your soup.
  • Fresh salad: Pair your hearty soup with a vibrant Greek Salad or Egg Salad for a fulfilling meal.
  • Roasted Chicken: Add a side of roasted chicken for a protein-rich, hearty dinner.
  • Green Beans: The crispness and freshness of green beans perfectly offset the soup's richness.
In a bowl, keto French onion soup is served with a spoon.

How to make it healthier?

  • Opt for a low-sodium chicken or beef stock. Alternatively, prepare it yourself at home.
  • Use organic onions, butter, and fresh herbs as much as possible.

Time-saving tips

  • Purchase pre-sliced onions from the grocery store to save preparation time.
Keto French onion soup in a pot with a ladle ready to be served.

What can I prepare ahead of time?

  • If you are preparing the stock yourself, do it a day ahead. Store it in an airtight glass jar in the fridge.

Storage and reheating instructions

Storage instructions

  • Refrigerator: Once the soup cools to room temperature, transfer it to an airtight container and store it in the fridge. It'll remain fresh for up to 3-4 days.

Best reheating practices

  • Microwave: Reheat individual servings in a microwave-safe bowl for 2-3 minutes on high power. Stir halfway through to ensure even heating.
  • Stovetop: Warm the leftover soup in a saucepan over medium heat until hot, stirring occasionally. It'll take around 5-7 minutes.

Recipe wrap-up and conclusion

This French Onion Soup recipe is essential for keto enthusiasts – it's heartwarming, soul-soothing, and perfect for those under-the-weather days. Simple to prepare with no complex ingredients, it's a dish you can prepare anytime.

Give it a try, and it's likely to become one of your favorite soups. Don't miss out on this deliciously comforting soup!

In search of more hearty meals like this? Here are some equally satisfying and delicious options:

Keto French onion soup is served in a white bowl with a spoon.

Frequently asked questions

Onions can be part of a keto diet if used in small amounts, as they contain some carbs.

Yes, French onion soup can be keto-friendly when made without sugar and using low-carb alternatives to traditional bread. The basic ingredients, like onions and chicken broth, are suitable for a keto diet.

The amount of carbs in French onion soup can vary depending on the recipe. A traditional recipe with bread and sugar may have over 15 grams of carbs per serving. However, our keto-friendly version has fewer carbs.

French onion soup is not typically gluten-free because it often includes bread as a topping and flour as a thickener. However, it can be made gluten-free by omitting the bread and thickener or using low-carb alternatives.

It's best not to freeze keto French onion soup, as freezing can change its texture. Enjoy it fresh, or store it in the refrigerator for the best quality.

Absolutely! Substitute chicken stock with vegetable broth for a vegetarian twist. The flavor will be slightly different but equally delightful.

Yes, French onion soup without bread is keto-friendly, mainly containing low-carb ingredients like onions and broth. Just ensure any added thickeners or toppings are also keto-friendly.

📖 Recipe

Keto French onion soup served in a bowl with a spoon.

Keto French Onion Soup Recipe (Low-Carb)

This Keto French Onion Soup offers a low-carb, gluten-free twist on the classic, combining caramelized onions with savory broth for a comforting delight.
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Course: Soup
Cuisine: French
Keyword: healing soup, keto soup, soup
Prep Time: 15 minutes
Cook Time: 1 hour 5 minutes
Total Time: 1 hour 20 minutes
Servings: 6
Calories: 103kcal

Ingredients

  • 1.5 pounds onions thinly sliced
  • 2 tablespoons clarified butter
  • 2 tablespoons wine vinegar
  • 6 cups warm chicken or beef stock
  • 1-2 parsley stems
  • 1-2 sprigs fresh thyme
  • 1 garlic clove
  • Sea salt to taste
  • Freshly cracked black pepper to taste
US Customary - Metric

Instructions

  • In a large pot, melt clarified or regular butter over medium heat.
  • Add thinly sliced onions, cook for 25-30 minutes, stirring frequently, until deeply caramelized and brown.
  • Once onions are caramelized, add vinegar and stir for a few minutes to intensify the flavors.
  • Pour in warm chicken or beef stock. Add a teabag containing parsley stem, thyme sprig, and garlic clove.
  • Bring to a simmer and cook for an additional 30-35 minutes.
  • After cooking, take out the teabag with herbs.
  • Season with sea salt and ground black pepper to taste.
  • Ladle the soup into bowls. Optionally, top with keto-friendly bread and shredded cheese.

Video

Nutrition

Nutrition Facts
Keto French Onion Soup Recipe (Low-Carb)
Amount Per Serving
Calories 103 Calories from Fat 45
% Daily Value*
Fat 5g8%
Saturated Fat 4g25%
Polyunsaturated Fat 1g
Monounsaturated Fat 3g
Cholesterol 13mg4%
Sodium 348mg15%
Potassium 423mg12%
Carbohydrates 12g4%
Fiber 2g8%
Sugar 9g10%
Protein 2g4%
Vitamin A 31IU1%
Vitamin C 10mg12%
Calcium 35mg4%
Iron 1mg6%
*

Nutritional values are estimates only and do not include carbs from sugar alcohols.

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