Quick Recipe Version (TL;DR)
Quick Ingredients
- 2 tbsp extra-virgin olive oil, plus more to finish
- 1 large yellow onion, diced (about 2 cups)
- 2 medium carrots, diced (about 1 cup)
- 2 celery stalks, diced (about 3/4 cup)
- 4 garlic cloves, minced
- 1 tbsp tomato paste
- 1 (14.5 oz) can diced tomatoes
- 1 1/2 cups dried brown or green lentils, rinsed and picked over
- 6 cups low-sodium vegetable broth
- 2 cups water
- 1 bay leaf
- 1 tsp dried thyme
- 1/2 tsp dried rosemary (crushed)
- 1 1/4 tsp kosher salt, plus more to taste
- 1/2 tsp black pepper, plus more to taste
- 2 tbsp lemon juice
- 1/3 cup chopped fresh parsley
- To serve: olive oil drizzle and/or plain yogurt
Do This
- 1. Sauté onion, carrots, and celery in 2 tbsp olive oil over medium heat until softened, 8–10 minutes.
- 2. Stir in garlic and tomato paste; cook 1 minute.
- 3. Add tomatoes, lentils, broth, water, bay leaf, thyme, rosemary, salt, and pepper; bring to a boil.
- 4. Reduce to a gentle simmer, cover partially, and cook until lentils are tender, 35–40 minutes.
- 5. Mash or blend a small portion to thicken; simmer 5 minutes more.
- 6. Off heat, stir in lemon juice and parsley; adjust salt and pepper.
- 7. Serve hot with a drizzle of olive oil and/or a spoonful of plain yogurt.
Why You’ll Love This Recipe
- Hearty and comforting: Lentils turn thick and velvety without any cream.
- Simple pantry staples: A few vegetables, canned tomatoes, and dried lentils do the heavy lifting.
- Big flavor, low effort: Slow simmering builds a “barn soup” depth with very little fuss.
- Flexible for leftovers: It reheats beautifully and gets even better the next day.
Grocery List
- Produce: 1 large yellow onion, 2 medium carrots, 2 celery stalks, 4 garlic cloves, 1 lemon, 1 small bunch fresh parsley
- Dairy: Plain yogurt (optional, for serving)
- Pantry: Extra-virgin olive oil, tomato paste, 1 (14.5 oz) can diced tomatoes, dried brown or green lentils, low-sodium vegetable broth, bay leaf, dried thyme, dried rosemary, kosher salt, black pepper
Full Ingredients
Base Soup
- 2 tbsp extra-virgin olive oil
- 1 large yellow onion, diced (about 2 cups)
- 2 medium carrots, diced (about 1 cup)
- 2 celery stalks, diced (about 3/4 cup)
- 4 garlic cloves, minced
- 1 tbsp tomato paste
- 1 (14.5 oz / 411 g) can diced tomatoes (with juices)
- 1 1/2 cups (300 g) dried brown or green lentils, rinsed and picked over
- 6 cups (1.4 L) low-sodium vegetable broth
- 2 cups (480 ml) water
- 1 bay leaf
- 1 tsp dried thyme
- 1/2 tsp dried rosemary, crushed between your fingers
- 1 1/4 tsp kosher salt (add more to taste at the end)
- 1/2 tsp freshly ground black pepper
To Finish
- 2 tbsp (30 ml) lemon juice (about 1/2 lemon)
- 1/3 cup (15 g) chopped fresh parsley
To Serve
- Extra-virgin olive oil, for drizzling (about 1 tsp per bowl)
- Plain yogurt (2–3 tbsp per bowl), optional
- Freshly ground black pepper, optional
Step-by-Step Instructions
Step 1: Prep your vegetables and lentils
Dice the onion, carrots, and celery into small, even pieces so they cook at the same pace. Mince the garlic. Rinse the lentils in a fine-mesh strainer and quickly pick through them for any small stones or debris.
This soup is rustic, not fussy, but evenly chopped vegetables make it feel extra cozy and consistent in every spoonful.
Step 2: Sauté the “soup base” until sweet and soft
Set a large Dutch oven or heavy-bottomed pot over medium heat. Add 2 tbsp extra-virgin olive oil. Stir in the onion, carrots, and celery.
Cook, stirring occasionally, until the onion is translucent and the vegetables have softened, 8–10 minutes. You’re building the soup’s backbone here, so don’t rush this step.
Step 3: Bloom the garlic and tomato paste
Add the minced garlic and cook, stirring, for 30 seconds (just until fragrant). Add the 1 tbsp tomato paste and stir continuously for 1 minute.
Cooking the tomato paste briefly deepens it from bright and sharp to rich and savory, which gives the soup that “slow-simmered” barn-soup feeling.
Step 4: Add tomatoes, lentils, broth, and herbs
Pour in the diced tomatoes (with their juices), then add the lentils, vegetable broth, water, bay leaf, thyme, rosemary, salt, and pepper. Stir well, scraping up any flavorful bits from the bottom of the pot.
Increase heat to bring the soup to a boil, about 5–7 minutes.
Step 5: Simmer gently until thick and tender
Once boiling, reduce heat to low to maintain a steady, gentle simmer. Partially cover the pot (leave the lid slightly ajar so it reduces and thickens). Simmer until the lentils are tender and the soup looks hearty, 35–40 minutes, stirring every 10 minutes.
If the soup thickens more than you like, add additional water in 1/2 cup increments. If it seems thin, keep simmering uncovered for a few extra minutes.
Step 6: Thicken for that rustic “barn soup” texture
Remove and discard the bay leaf. To thicken, use one of these easy methods:
Option A (quick mash): Use a potato masher to mash the soup directly in the pot 8–12 times, focusing on breaking up some lentils and vegetables while keeping plenty of texture.
Option B (brief blend): Ladle about 2 cups of soup into a blender, vent the lid, and blend until smooth, then stir it back into the pot.
Simmer 5 minutes more to help everything come together.
Step 7: Finish with lemon and herbs, then serve
Turn off the heat. Stir in the 2 tbsp lemon juice and 1/3 cup chopped parsley. Taste and adjust seasoning with more salt and pepper if needed.
Ladle into bowls. Finish each serving with a drizzle of extra-virgin olive oil and/or a spoonful of plain yogurt. The olive oil adds a fruity richness; the yogurt adds a tangy, creamy contrast.
Pro Tips
- Keep the simmer gentle: A rapid boil can break down lentils too aggressively and reduce the soup unevenly. Aim for small, steady bubbles.
- Crush the rosemary: Rub dried rosemary between your fingers before adding so it disperses better and tastes less “twiggy.”
- Salt timing matters: Start with the listed amount, then adjust at the end. Broth saltiness varies a lot.
- Thicken without flour: Mashing or blending a portion gives a naturally creamy texture from the lentils themselves.
- Finish with fat and acid: The final olive oil (fat) and lemon (acid) wake up the whole pot.
Variations
- Smoky barn soup: Add 1 tsp smoked paprika with the tomato paste, or stir in 1/2 tsp smoked paprika at the end for gentle warmth.
- Greens welcome: Stir in 4 cups (about 120 g) chopped kale during the last 10 minutes of simmering.
- Spicier bowl: Add 1/4–1/2 tsp red pepper flakes with the garlic, or finish bowls with a pinch on top.
Storage & Make-Ahead
Cool soup to room temperature (about 30 minutes), then refrigerate in an airtight container for up to 5 days. Reheat gently on the stovetop over medium-low heat until steaming hot, 8–12 minutes, adding a splash of water or broth if it has thickened.
For longer storage, freeze for up to 3 months. Thaw overnight in the refrigerator, then reheat as above. Add the parsley and lemon juice after reheating for the freshest flavor.
Nutrition (per serving)
Approximate, per 1/6 of recipe (without yogurt): 320 calories; 10 g fat; 44 g carbohydrates; 16 g protein; 16 g fiber; 620 mg sodium.
