Easy French Lentil Soup (High Protein & High Fiber)

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This easy French lentil soup is the kind of cozy, wholesome meal you will want on repeat all season. Earthy French green lentils simmer with potatoes, carrots, celery, garlic, bay leaves and thyme in a savory vegetable broth until everything is tender and the soup turns thick and hearty.

It is naturally high in protein and fiber, made with simple pantry staples, and ready in about an hour. Serve it with a slice of crusty bread for a filling lunch or dinner.

Why You’ll Love This French Lentil Soup

• High protein and high fiber: lentils and potatoes make every bowl satisfying.
• One pot: everything simmers together, so cleanup is easy.
• Pantry friendly: dried lentils, broth and basic vegetables.
• Vegan and dairy-free: naturally plant-based with vegetable broth.
• Lentils hold their shape: French green lentils stay pleasantly firm instead of turning mushy.
• Meal prep star: it tastes even better the next day and freezes well.

Ingredients You’ll Need

This French lentil soup recipe uses everyday ingredients, listed here in US cups and grams.

For the Vegetable Base

• 2 tablespoons (30 ml) olive oil: for sauteing the vegetables.
• 1 large onion, diced (about 1 1/2 cups / 200 g): yellow or white both work.
• 2 medium carrots, diced (about 1 cup / 130 g): add sweetness and color.
• 2 celery ribs, diced (about 3/4 cup / 100 g): classic savory flavor.
• 4 cloves garlic, minced: or 1/2 teaspoon garlic powder in a pinch.
• 2 tablespoons (32 g) tomato paste: deepens the color and adds savory richness.

For the Soup

• 1 1/2 cups (300 g) French green lentils: rinsed and picked over. Brown or green lentils also work but soften more.
• 1 pound (450 g) yellow potatoes, diced (about 3 cups): waxy potatoes keep their shape.
• 6 cups (1.4 liters) vegetable broth: low-sodium lets you control the salt.
• 2 cups (480 ml) water: loosens the soup as the lentils absorb liquid.
• 2 bay leaves and 1 teaspoon dried thyme: the classic French herb pairing.
• 1 teaspoon salt and 1/2 teaspoon black pepper: adjust to taste at the end.
• 1 tablespoon lemon juice or red wine vinegar: a splash at the end brightens all the flavors.

How to Make French Lentil Soup

Making French lentil soup is simple: build a flavorful base, then let the pot do the work.

Step 1: Saute the Vegetables

1. Heat the olive oil in a large pot or Dutch oven over medium heat.
2. Add the onion, carrots and celery with a pinch of salt and cook 6 to 8 minutes, until softened.
3. Stir in the garlic and tomato paste and cook 1 minute, until fragrant and the paste darkens slightly.

Step 2: Simmer the Lentils and Potatoes

1. Add the rinsed lentils, potatoes, broth, water, bay leaves, thyme, salt and pepper.
2. Bring to a boil, then reduce the heat, partially cover and simmer 30 to 35 minutes, stirring now and then, until the lentils and potatoes are tender.

Step 3: Finish and Season

1. Remove the bay leaves.
2. For a creamier texture, blend about 2 cups of the soup and stir it back in, or mash a few potatoes against the side of the pot.
3. Stir in the lemon juice or vinegar, taste and adjust the salt and pepper. Add a splash of water if it is too thick.

Always rinse dried lentils and pick out any small stones before cooking, and follow basic safe food handling when cooling and storing soup.

Expert Tips for the Best French Lentil Soup

• Pick over the lentils: spread them on a plate to spot tiny stones or debris.
• Do not salt too heavily early: broth reduces as it simmers, so season at the end.
• Cut the potatoes evenly: 1/2-inch cubes cook at the same pace as the lentils.
• Cook the tomato paste: a minute in the hot oil removes its raw taste.
• Add acid last: lemon juice or vinegar wakes up the earthy lentils.
• Thin as needed: lentils keep absorbing liquid, especially as leftovers.
• Use a heavy pot: a Dutch oven holds steady heat so the soup simmers gently without scorching on the bottom.

French Green Lentils vs Brown Lentils

French green lentils are small, dark and speckled, with a peppery flavor. They hold their shape after cooking, so the soup stays hearty with distinct lentils. They are traditionally grown in France, but you can find French-style green lentils in most grocery stores near the dried beans.

Brown and regular green lentils are milder and break down more, which makes a thicker, softer soup. They work in this recipe too; just start checking for doneness after about 20 minutes. Red lentils are not a good swap because they turn to puree.

Why This Soup Is So Filling

Lentils are one of the most protein-rich plant foods, and they are packed with fiber, so a bowl of French lentil soup keeps you full for hours. Potatoes add comforting body and extra fiber, while carrots, celery and onion bring vitamins and natural sweetness.

Because it is made without cream or meat, the soup is also light and budget friendly. Pair it with crusty bread or a salad for a balanced meal.

Variations

Once you know the basic method, it is easy to change things up with what you have on hand.

• Greens: stir in 2 handfuls of spinach or chopped kale during the last 5 minutes.
• Smoky: add 1 teaspoon smoked paprika with the tomato paste.
• Sausage: brown sliced smoked sausage with the onions for a meaty version.
• Herby: finish with chopped fresh parsley.
• Slow cooker: saute the base, then cook everything on low 6 to 8 hours.

What to Serve With French Lentil Soup

A thick slice of crusty bread or a warm baguette is the classic partner for dipping. A simple green salad with vinaigrette also keeps the meal light. For a heartier spread, set out a bowl of French lentil soup with grilled cheese sandwiches or a board of cheese, olives and pickles.

Love hearty soups? Try our chicken and dumplings soup on a cold night. For more cozy comfort food, our shepherd’s pie is a family favorite.

Make Ahead and Freezing

Make ahead: this high protein lentil soup is ideal for meal prep. Make it up to 4 days ahead and refrigerate; the flavors deepen overnight.

Freezing: cool completely, then freeze in airtight containers for up to 3 months. Illinois Extension recommends a freezer temperature of 0°F for the best quality. Potatoes may soften slightly after thawing, which only makes the soup creamier.

Storage and Reheating

Refrigerate leftover French lentil soup in a covered container within 2 hours of cooking and enjoy within 4 days.

Reheat on the stove over medium heat or in the microwave, stirring halfway, until steaming hot. Add a splash of broth or water to loosen it. For another warming bowl later in the week, try our coconut beef curry.

Frequently Asked Questions

Here are answers to the most common questions about making this easy lentil soup at home.

Do I need to soak French lentils?

No. French green lentils cook in about 30 minutes without soaking. Just rinse and pick them over.

Is French lentil soup vegan?

Yes. Made with vegetable broth and olive oil, this vegan French lentil soup is completely plant-based.

Why are my lentils still hard?

Old lentils take longer to cook, and acid can slow softening. Keep simmering, and add the lemon juice or vinegar only at the end.

Can I use other potatoes?

Yes. Russets work but break down more and thicken the soup. Red potatoes hold their shape well.

How do I make French lentil soup thicker?

Simmer it uncovered for 10 extra minutes, or blend a portion and stir it back in. Mashing a few potato cubes against the side of the pot also thickens it quickly without a blender.

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