Easy Lemony Red Lentil Soup Recipe | One-Pot Vegetable Soup
Quick overview
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Prep Time: 5 minutes | Cook Time: 55 minutes | Total Time: 1 hour | Yield: 6-8 portions | Difficulty: Easy
Description
This easy one-pot red lentil soup is naturally creamy, packed with vegetables, and brightened with fresh lemon. Made with simple pantry staples and frozen vegetables, this healthy vegetable lentil soup is perfect for busy weeknights and meal prep. The red lentils break down during cooking to create a thick, velvety texture without any cream or blending required.
Why You'll Love This Red Lentil Soup Recipe
Simple & Convenient
One-pot recipe with minimal cleanup
Uses freezer and pantry staples
Hands-off cooking—just simmer and stir occasionally
No chopping required with frozen mirepoix (mixture of carrots, onions, and celery)
Healthy & Nutritious
High in plant-based protein from red lentils
Packed with vegetables and fiber
Naturally gluten-free
Low-fat and heart-healthy
Delicious Flavour
Naturally thick and creamy without dairy
Bright, fresh lemon flavour
Savoury vegetable base with hint of sweetness from squash
Comforting yet light and refreshing
Meal Prep Friendly
Makes 6-8 generous servings
Freezes beautifully for up to 3 months
Reheats well without losing flavour or texture
Tastes even better the next day
Ingredients for Lemony Red Lentil Soup
Main Ingredients
750 g (1 bag) frozen mirepoix (onions, carrots, celery)
½ package frozen butternut squash purée (about 250g)
1 teaspoon dried thyme
1 teaspoon granulated garlic (or garlic powder)
1 can (28 fl oz / 796 ml) diced tomatoes
1 litre (4 cups) chicken broth or vegetable broth
1 litre (4 cups) water
2 cups (400g) red lentils, rinsed
Salt, to taste
Rind of 1 lemon (zested or peeled in strips)
Optional Toppings & Serving Suggestions
Freshly grated Parmesan cheese
Fresh cilantro or parsley, chopped
Toasted sourdough bread
Warm garlic naan bread
Drizzle of olive oil
Red pepper flakes for heat
Plain Greek yogurt or sour cream
How to Make Lemony Red Lentil Soup
Step 1: Combine Ingredients
Add frozen mirepoix, butternut squash purée, dried thyme, granulated garlic, diced tomatoes (with juices), chicken broth, water, and red lentils to a large stock pot or Dutch oven. Stir to combine. Reserve the lemon rind for later.
Step 2: Bring to a Boil
Place the pot over medium heat and bring the soup to a light boil. This takes about 10 minutes.
Step 3: Simmer the Soup
Once boiling, reduce heat to low. Let the soup simmer uncovered for 45-60 minutes, stirring occasionally every 10-15 minutes.
What happens during simmering:
The red lentils will completely break down and dissolve
The soup will naturally thicken to a creamy consistency
The flavours will meld together beautifully
The vegetables will become tender
Step 4: Add Lemon and Season
After simmering, stir in the lemon rind. Taste and add salt as needed (start with ½ teaspoon and adjust). Let the soup rest for 5 minutes to allow the lemon flavour to infuse.
Step 5: Serve
Ladle the hot soup into bowls and garnish with your favorite toppings. Serve with crusty bread for dipping.
Why Add Lemon Rind at the End?
Adding lemon rind at the end of cooking (rather than at the beginning) preserves its bright, fresh citrus aroma and essential oils. When lemon rind is cooked for too long, it can become bitter and lose its vibrant flavour. This technique infuses the soup with a gentle lemon essence that lifts all the other flavours without adding harsh acidity or overpowering the vegetables and lentils.
Pro Tip: Use a vegetable peeler to remove wide strips of lemon rind, avoiding the white pith. You can remove the strips before serving, or leave them in for a stronger lemon flavour.
Recipe Tips for the Best Lentil Soup
Choosing Your Lentils
Why red lentils? Red lentils (also called pink or orange lentils) cook quickly and break down completely, creating a naturally creamy texture. They're perfect for smooth, thick soups.
Can you use other lentils? Green or brown lentils will work but won't create the same creamy texture. They'll stay intact and give you a chunkier, more textured soup. If using green or brown lentils, you may want to blend part of the soup (I recommend half) for creaminess.
Making It Vegetarian/Vegan
Replace chicken broth with vegetable broth for a completely vegetarian and vegan-friendly soup. The flavour will be just as delicious.
Adjusting Consistency
Too thick? Add more broth or water, ¼ cup at a time, until you reach desired consistency
Too thin? Simmer uncovered for 10-15 more minutes to reduce and thicken, or add ¼ cup more red lentils and cook for 15 minutes
Storage & Meal Prep
Refrigerator: Store in an airtight container for up to 4-5 days. The soup will thicken as it sits—add a splash of water or broth when reheating.
Freezer: Freeze in portions for up to 3 months. Use freezer-safe containers or bags. Thaw overnight in the refrigerator and reheat on the stovetop.
Reheating:
Option 1: Warm on the stovetop over medium-low heat, stirring occasionally. Add liquid if needed.
Option 2: Microwave individual portions for 2-3 minutes, stirring halfway through.
What to Serve with Red Lentil Soup
This lemony lentil soup pairs beautifully with:
Breads & Grains
Crusty sourdough bread or baguette
Warm pita bread or garlic naan
Cornbread or focaccia
Buttery dinner rolls
Salads
Simple green salad with vinaigrette
Mediterranean chickpea salad
Cucumber and tomato salad
Arugula salad with lemon dressing
Proteins (if serving as a side)
Grilled chicken
Italian sausage
Some sort of white fish
Falafel
Nutritional Benefits of Red Lentil Soup
Red lentils are a nutritional powerhouse:
High in protein: About 18g protein per cup of cooked lentils
Rich in fiber: Supports digestive health and keeps you full
Packed with iron: Important for energy and blood health
Good source of folate: Essential B vitamin
Low in fat and calories: Perfect for healthy eating goals
This soup is naturally low in fat, high in fiber, and provides a complete nutritious meal when served with whole grain bread.
Recipe Variations & Substitutions
Spice It Up
Add ½ teaspoon cumin, ½ teaspoon coriander, ½ reed pepper flakes or ¼ teaspoon cayenne pepper for a warming, spiced version.
Add Greens
Stir in 2-3 cups fresh spinach or kale during the last 5 minutes of cooking for extra nutrients.
Make It Heartier
Add 1-2 diced potatoes or sweet potatoes at the beginning for a more filling soup.
Different Vegetables
No butternut squash? Use frozen sweet potato cubes, pumpkin purée, or skip it entirely—the soup will still be delicious.
Fresh Mirepoix
If you don't have frozen mirepoix, chop 1 large onion, 2 carrots, and 2 celery stalks.
Frequently Asked Questions (FAQ)
What is mirepoix and what if I don't have frozen mirepoix?
Mirepoix is a classic French combination of diced onions, carrots, and celery used as an aromatic base for soups, stews, and sauces. It's typically mixed in a 2:1:1 ratio (onions to carrots to celery). If you don't have frozen mirepoix, simply chop your own fresh vegetables: use 1 large onion (diced), 2 medium carrots (diced), and 2 celery stalks (diced). This equals about 3 cups total or approximately 400-450g. Sauté the fresh vegetables in 1 tablespoon olive oil, and 1/2 tsp of kosher salt for 3-5 minutes before adding the other ingredients for even better flavour.
Can I use fresh garlic instead of granular garlic?
Absolutely! You can substitute 3-4 cloves of fresh minced garlic for the 1 teaspoon of granular garlic. If using fresh garlic, add it at the beginning with the other vegetables when sautéing —just be careful not to burn it. Fresh garlic will give you a more pungent, vibrant garlic flavour, while granular garlic provides a milder, evenly distributed taste throughout the soup. I recommend granular, and only use fresh garlic if I don’t have granular garlic on hand.
Can I freeze lentil soup?
Yes! This red lentil soup freezes beautifully. Let it cool completely, then transfer to freezer-safe containers or bags. Freeze for up to 3 months. Thaw in the refrigerator overnight and reheat on the stovetop, adding a splash of water or broth if needed to thin it out.
Can I use green lentils instead of red lentils?
You can, but the texture will be different. Green or brown lentils hold their shape and won't break down like red lentils, so your soup will be chunkier rather than creamy. If you prefer a smooth soup with green lentils, blend half the soup after cooking. Green lentils also take longer to cook (45-60 minutes versus 20-30 for red).
Is this lentil soup vegan?
This recipe uses chicken broth, so it's not vegan. To make it vegan, simply substitute vegetable broth for the chicken broth. The flavour will be just as delicious, and you can boost the umami by adding 1 tablespoon soy sauce or miso paste.
How long does lentil soup last in the fridge?
Stored in an airtight container, this soup will keep for 4-5 days in the refrigerator. The soup thickens as it sits, so you may need to add a little water or broth when reheating. Always smell and visually inspect before eating refrigerated soup.
Why is my lentil soup bitter?
Bitterness in lentil soup can come from: (1) cooking lemon rind too long—add it at the end as instructed, (2) burned garlic or vegetables—make sure to use medium-low heat when simmering, or (3) old or rancid lentils—always use fresh lentils and store them in an airtight container. If your soup tastes bitter, try adding a pinch of sugar or a splash of lemon juice to balance it.
Do I need to soak red lentils before cooking?
No! Unlike beans, red lentils don't need to be soaked before cooking. Simply rinse them in a fine-mesh strainer to remove any debris, then add them directly to the pot. They cook quickly (20-30 minutes) and will dissolve into the soup, creating a creamy texture.
Can I make this soup in a slow cooker or Instant Pot?
Slow Cooker: Add all ingredients except lemon rind to your slow cooker. Cook on low for 6-8 hours or high for 3-4 hours. Stir in lemon rind before serving.
Instant Pot: Use the sauté function to warm the ingredients if desired, then add everything except lemon rind. Cook on high pressure for 15 minutes, then natural release for 10 minutes. Stir in lemon rind and season with salt.
How do I make this soup thicker?
This soup naturally thickens as it cooks because red lentils break down. If its been simmering for 1 hour and you want it even thicker: (1) simmer longer uncovered to evaporate more liquid, (2) add another ¼-½ cup red lentils and cook for 15 more minutes, (3) use an immersion blender to partially blend the soup, or (4) mash some of the soup against the side of the pot with a spoon.
How do I make this soup thinner?
If your soup is too thick, simply add more liquid. Stir in chicken broth, vegetable broth, or water ¼ cup at a time until you reach your desired consistency. The soup thickens significantly as it sits and cools, so you may need to thin it when reheating leftovers.
Can I add meat to this soup?
Absolutely! For a heartier soup, add: cooked shredded chicken in the last 10 minutes, browned Italian sausage at the beginning, or cooked bacon crumbled on top at the very end. If adding raw meat, brown it first in the pot before adding other ingredients.
What's the difference between lemon rind and lemon zest?
Lemon rind refers to strips of the yellow outer peel (removed with a vegetable peeler or knife), while lemon zest is the finely grated yellow peel. For this recipe, either works! Strips are easier to remove before serving, while zest disperses throughout the soup for more even flavour.
Is this soup gluten-free?
Yes! All the ingredients in this recipe are naturally gluten-free. Just make sure that ingredients havent come in cross-contact with grains during farming, harvesting and storage. Choosing brands that are labeled “gluten-free”, or “certified gluten-free” is the safest option to avoid contamination. Also make sure your broth is certified gluten-free (some brands add wheat-based additives). Serve with gluten-free bread, if needed.
Can I use fresh tomatoes instead of canned?
Yes, you can substitute 3-4 cups of diced fresh tomatoes for the canned tomatoes. However, canned tomatoes provide more concentrated flavour and consistent results. If using fresh, you may want to add 1 tablespoon tomato paste for extra depth.
Why is my soup foaming?
Lentils naturally produce some foam when cooking, especially at the beginning of boiling. This is normal and harmless—it's just starch and protein rising to the surface. Simply skim off the foam with a spoon if you'd like, or ignore it and stir it back in.
Recipe Card
Easy Lemony Red Lentil Soup
A one-pot, naturally creamy red lentil and vegetable soup with bright lemon flavour. Perfect for meal prep and busy weeknights.
Prep Time: 5 minutes | Cook Time: 55 minutes | Total Time: 60 minutes
Servings: 6-8 | Cuisine: Mediterranean-Inspired | Diet: Vegetarian, Gluten-Free
Ingredients:
750g frozen mirepoix
½ package frozen butternut squash purée
1 tsp dried thyme
1 tsp granulated garlic
1 can (28 oz) diced tomatoes
1 litre chicken or vegetable broth
1 litre water
2 cups red lentils, rinsed
Rind of 1 lemon
Salt, to taste
Instructions:
Add all ingredients except lemon rind to a large pot over medium heat
Bring to a light boil (about 5-10 minutes)
Reduce heat to low and simmer for 45-60 minutes, stirring occasionally. The soup will thicken and lentils will dissolve.
Stir in lemon rind and season with salt
Serve hot with bread or toppings of choice
Storage: Refrigerate up to 4-5 days or freeze up to 3 months.
Final Thoughts
This Easy Lemony Red Lentil Soup is the perfect recipe for anyone looking for a healthy, comforting, and flavourful meal that doesn't require hours in the kitchen. With just one pot, simple ingredients, and minimal effort, you can create a restaurant-quality soup that's perfect for meal prep, weeknight dinners, or feeding a crowd.
The combination of red lentils, vegetables, and fresh lemon creates a soup that's both nourishing and satisfying—creamy without cream, filling without being heavy, and bright without being acidic. Whether you're new to cooking with lentils or a seasoned soup maker, this recipe delivers warmth, balance, and ease in every bowl.
