Amy’s Light in Sodium Lentil Vegetable Soup is a vegetable-packed lentil soup inspired by the familiar canned version, made at home with low-sodium broth and no added salt. Brown lentils, carrots, celery, tomatoes, and gentle herbs simmer into a hearty meal; taste before seasoning, since broth and canned vegetables vary in sodium.
Ingredients
- 1 tablespoon olive oil (15 ml)
- 1 medium yellow onion, diced (about 1 cup / 150 g)
- 2 medium carrots, diced (about 1 cup / 130 g)
- 2 celery ribs, diced (about 1 cup / 100 g)
- 2 garlic cloves, minced (about 6 g)
- 1 cup brown or green lentils, rinsed and picked over (190 g)
- 1 can no-salt-added diced tomatoes, with juices (14.5 oz / 411 g)
- 6 cups no-salt-added vegetable broth (1.4 L)
- 1 teaspoon dried Italian seasoning (1 g)
- ½ teaspoon ground cumin (1 g)
- 1 bay leaf
- ½ teaspoon black pepper (1 g), plus more to taste
- 1 cup chopped zucchini (about 130 g)
- 1 cup chopped fresh spinach (about 30 g)
- 1 tablespoon lemon juice (15 ml), plus more to taste
- Salt, optional and to taste
Instructions
- Prepare the vegetables. Dice the onion, carrots, celery, and zucchini into small, similar-sized pieces so they cook evenly. Rinse the lentils in a fine-mesh strainer and remove any shriveled lentils or debris. Brown or green lentils hold their shape well; red lentils soften more quickly and make a thicker, less distinct soup.
- Soften the aromatics. Warm the olive oil in a large heavy pot over medium heat. Add the onion, carrots, and celery. Cook for 6 to 8 minutes, stirring occasionally, until the onion looks translucent and the vegetables begin to soften. If they start browning, lower the heat; the goal is a gentle base, not a dark sear.
- Add garlic and spices. Stir in the garlic, Italian seasoning, cumin, and black pepper. Cook for about 30 seconds, just until fragrant. Do not let the garlic turn brown, which can give the soup a bitter taste.
- Simmer the lentils. Add the rinsed lentils, tomatoes and their juices, vegetable broth, and bay leaf. Bring the pot to a boil, then reduce the heat to maintain a steady, gentle simmer. Partially cover and cook for 30 to 35 minutes, stirring once or twice, until the lentils are tender but not collapsing. If the surface is bubbling vigorously, lower the heat.
- Finish with zucchini and spinach. Stir in the zucchini and simmer for 5 to 7 minutes, until it is tender but still holds its shape. Remove the pot from the heat, discard the bay leaf, and stir in the spinach and lemon juice. The spinach wilts in the hot soup. Taste and add a little more lemon or pepper; add salt only if needed.
- Adjust and serve. If the soup is thicker than you like, stir in hot water or additional no-salt-added broth, ¼ cup (60 ml) at a time. If you prefer a thicker texture, mash a small scoop of lentils against the side of the pot and stir them back in. Ladle into bowls while hot.
Tips
- Check lentils before cooking. Lentils do not need soaking, but they should be rinsed and checked for small stones or debris. Older lentils can take longer to soften, so use tenderness—not just the timer—to decide when they are ready.
- Keep the sodium low without losing flavor. Choose broth and canned tomatoes labeled no-salt-added, and check the package labels because “low sodium” products still contain varying amounts. Lemon juice, black pepper, cumin, and herbs add brightness; taste before adding salt.
- Make it your preferred thickness. Lentils absorb liquid as they cook and as the soup stands. Add broth or water to loosen it, especially when reheating. Avoid boiling hard, which can break up the vegetables and lentils.
- Use fresh seasoning thoughtfully. Dried herbs go into the pot early so they can flavor the broth. If using fresh parsley instead of Italian seasoning, add about 2 tablespoons (8 g) chopped parsley near the end; the result will taste fresher and less herbal.
Serving Suggestions
Serve the soup as a filling main course with whole-grain bread, toast, or a simple green salad. A spoonful of plain yogurt or a sprinkle of chopped parsley can add a cool, creamy or fresh contrast, though these are optional. For a heartier bowl, offer cooked brown rice or small pasta on the side rather than adding it to the whole pot; pasta continues to absorb broth in storage.
Set out lemon wedges so each person can adjust the brightness. If serving with bread or crackers, compare labels if sodium is a concern, since those sides can contribute more salt than the soup itself.
Variations
Use different vegetables: Replace the zucchini with 1 cup (130 g) chopped green beans or diced bell pepper. Add green beans with the lentils so they have time to soften; add bell pepper with the onion, carrot, and celery.
Make it more tomato-forward: Stir in 1 tablespoon (16 g) tomato paste with the garlic and spices, then add the tomatoes and broth. Tomato paste deepens the flavor but may contribute sodium, so check its label.
Change the herbs: Swap the Italian seasoning and cumin for 1 teaspoon (1 g) dried thyme and ½ teaspoon (1 g) smoked paprika. This gives the soup a warmer, slightly smoky character. For a mild kick, add a pinch of red pepper flakes.
Make it vegan or gluten-free: The recipe as written is vegan if the broth is vegetable-based, and it is naturally gluten-free when the broth and seasonings are labeled gluten-free. Check packaged ingredients if cooking for someone who must avoid gluten.
Storage and Reheating
Cool leftovers promptly and refrigerate them within 2 hours of cooking, divided among shallow, covered containers for faster cooling. Keep refrigerated at 40°F (4°C) or colder and use within 3 to 4 days. The lentils will continue absorbing liquid, so expect the soup to thicken.
Reheat only the portion you plan to eat on the stove over medium heat, stirring occasionally, or in a microwave-safe covered container, stirring partway through. Add water or broth as needed. Reheat leftovers to 165°F (74°C), checking with a food thermometer, and bring soup to a steaming hot state throughout. For longer storage, freeze in meal-size airtight containers for up to 3 months for best quality; thaw overnight in the refrigerator and reheat to 165°F (74°C). Do not leave cooked soup at room temperature for more than 2 hours.
Frequently Asked Questions
Can I use canned lentils?
Yes. Drain and rinse about 3 cups (roughly 510 g) of canned lentils, then add them after the broth and tomatoes have simmered for about 20 minutes. Cook until the vegetables are tender, around 10 to 15 minutes, so the canned lentils do not turn mushy. They may contain added sodium, so check the label.
Do I need to soak the lentils?
No. Brown and green lentils cook without soaking. Rinsing and picking them over is sufficient. Soaking can shorten the cooking time, but it is unnecessary for this recipe and may make the lentils softer than intended.
Why are my lentils still firm?
They may be older, or the pot may not have stayed at a steady simmer. Continue cooking and check every 5 minutes, adding a splash of water if the broth level gets low. Acidic ingredients can slow softening, but the tomatoes are added here with plenty of cooking time; simply allow extra time if needed.
Can I make the soup ahead?
Yes. Make it up to 3 or 4 days ahead and refrigerate it promptly. The flavor melds as it rests, but the soup also thickens, so add broth or water while reheating and check that it reaches 165°F (74°C).
Can I make this in a slow cooker?
Yes. Soften the onion, carrots, and celery in a skillet first for the best flavor, then transfer them to the slow cooker with the garlic, spices, lentils, tomatoes, broth, and bay leaf. Cook on low for about 6 to 7 hours or high for 3 to 4 hours, until the lentils are tender. Stir in zucchini for the final 30 to 45 minutes and add spinach and lemon at the end. Slow cookers vary, so check the lentils for doneness.
How can I make it less thick the next day?
Stir in hot water or no-salt-added broth a little at a time as you reheat. Lentils naturally take up liquid while the soup is stored, so thinning it just before serving gives you better control of the final texture.
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