How to Make Lentil Soup from Scratch: A Step-by-Step Guide

Quick Answer

To make lentil soup from scratch, sauté aromatics, add rinsed lentils, broth, and seasonings, then simmer until tender. For a low-sodium version, use no-salt-added broth and season with herbs and spices instead of salt.

Lentil soup is a comforting, protein-packed meal that comes together easily with pantry staples. Making it from scratch lets you control the flavor, texture, and sodium level—something canned versions can't always offer.

This step-by-step guide walks you through the entire process, from rinsing lentils to simmering the soup to perfection. You'll also learn how to adjust the recipe for a low-sodium diet and how to store leftovers for busy weeknights.

Why Make Lentil Soup from Scratch?

Canned lentil soup is convenient, but homemade gives you full control over ingredients and seasoning. You can skip excess sodium, adjust the spice level, and use the exact vegetables you have on hand. Plus, a pot of lentil soup is budget-friendly and makes great leftovers.

Lentils are naturally rich in plant-based protein and fiber, making them a satisfying choice for vegetarian and vegan meals. When you cook them from scratch, you can also choose the type of lentil—brown, green, or red—to get the texture you prefer.

• Use brown or green lentils for a firmer texture that holds up in soup.
• Rinse lentils before cooking to remove debris and reduce foam.
• Don't add salt too early—it can slow down the cooking process.

Ingredients You'll Need

For a basic lentil soup, you'll need olive oil, onion, carrots, celery, garlic, dried lentils, vegetable broth, diced tomatoes (optional), and seasonings like cumin, thyme, and black pepper. You can also add spinach or kale at the end for extra greens.

For a low-sodium version, choose a no-salt-added or low-sodium vegetable broth. If you're using canned tomatoes, look for no-salt-added varieties. Season generously with herbs and spices—like smoked paprika or bay leaves—to add depth without relying on salt.

• Check the nutrition label on canned broth—some brands contain over 600 mg sodium per cup.
• Acidic ingredients like tomatoes can slow lentil softening; add them later in cooking if you prefer softer lentils.

Step-by-Step Cooking Method

Start by heating olive oil in a large pot over medium heat. Add chopped onion, carrots, and celery, and cook until softened, about 5–7 minutes. Add minced garlic and cook for another minute until fragrant.

Add rinsed lentils, broth, and your chosen seasonings. Bring to a boil, then reduce heat and simmer uncovered for 25–35 minutes, or until lentils are tender. Stir occasionally and add more liquid if needed. Finish with a splash of lemon juice or vinegar to brighten the flavors.

• If you like a thicker soup, mash some of the lentils against the side of the pot.
• For a creamier texture, blend a portion of the soup and stir it back in.

How to Reduce Sodium Without Sacrificing Flavor

Canned lentil soups often pack a lot of sodium—some brands contain 600 mg or more per serving. When you cook from scratch, you can keep sodium in check by using low-sodium broth and no-salt-added canned goods. Boost flavor with aromatics like garlic, onion, and celery, plus herbs like thyme, rosemary, and bay leaves.

A squeeze of lemon juice or a splash of vinegar at the end adds brightness that makes the soup taste more seasoned. You can also add a pinch of red pepper flakes for heat without salt. If you do add salt, do it at the end, tasting as you go.

• Try a 50% less sodium canned soup like Amy's Organic Light in Sodium Lentil Vegetable Soup when you're short on time—it still delivers flavor with less salt.

Step-by-Step: From Scratch to Bowl

1. Rinse and pick over lentils: Place dried lentils in a fine-mesh strainer and rinse under cold water. Remove any small stones or shriveled lentils you spot. Checkpoint: Lentils should look clean and uniform before cooking.
2. Sauté aromatics: Heat olive oil in a large pot over medium heat. Add diced onion, carrots, and celery. Cook until softened, about 5–7 minutes, then add minced garlic and cook 1 minute more. Common mistake: burning the garlic—keep the heat medium and stir frequently.
3. Add lentils and liquid: Add the rinsed lentils, low-sodium broth, and seasonings (like cumin, thyme, and black pepper). Stir to combine. Checkpoint: Ensure lentils are fully submerged in liquid.
4. Simmer until tender: Bring to a boil, then reduce heat to low and simmer uncovered for 25–35 minutes, or until lentils are tender. Stir occasionally and add more broth or water if the soup gets too thick. Common mistake: cooking on high heat can make lentils mushy on the outside and hard inside.
5. Season and finish: Taste the soup and adjust seasonings. Add a squeeze of lemon juice or a splash of vinegar to brighten flavors. If you like, stir in a handful of spinach or kale until wilted. Checkpoint: Seasoning at the end prevents over-salting and keeps the soup balanced.

Pantry Shortcuts That Keep It Healthy

• Lentil Vegetable Soup, Low in Sodium: One 14.5-oz can of Amy’s Organic Light in Sodium Lentil Vegetable Soup, Light in Sodium with 50% less sodium than Amy's soup Homestyle vegetable soup made with all organic vegetables, including green lentils, celery, spinach, carrots and potatoes for a delicious easy dinner or quick vegan meals without compromise This canned soup contains 6g of plant based protein and 5g of fiber per serving When you don't have time to cook from scratch, this canned option gives you a low-sodium, plant-based meal with real vegetables and a solid amount of protein and fiber.
• Lentil Soup, Light in Sodium: Plant-Based Soup: Made with organic green lentils, carrots, celery, onion, potatoes, and spices. Lightened Up: With 50% less sodium than Amy's regular lentil soup. Nutrition Notes: 6g protein and 4g dietary fiber* per serving, plus a good source of iron. Ready to Serve: Shake before opening, then warm on the stovetop or in the microwave. This is a convenient, low-sodium option that still offers plant-based protein and iron, making it a good backup for busy days when homemade soup isn't an option.

Making lentil soup from scratch is simple, budget-friendly, and lets you control the flavor and sodium. With this step-by-step guide, you'll have a hearty, healthy meal ready in about 40 minutes. And when time is tight, keep a low-sodium canned option like Amy's Light in Sodium Lentil Soup in your pantry for a quick backup.