Let’s Talk About Veggie Lentil Soup

You know those days when you peek in the fridge and—surprise!—there’s way too many veggies and not enough energy? That’s pretty much where this veggie lentil soup was born. My mom used to stir a giant pot on Sundays, and the house would fill up with savory, herby warmth. The cat (Gingersnap) would always try to steal a carrot. Sometimes it worked and sometimes…well, let’s just say, never underestimate a determined cat.

I think soup tastes better when you make it while chatting away, maybe with someone perched on the counter or, if you’re like me, occasionally venting at the lentils that just. won’t. soften. As for this particular recipe, it checks all my boxes—hearty, packed with whatever’s on hand (I mean, have you tried celery root before?) and it keeps me fed for more than just the first dreamy bowl. Though, let’s be honest, day one is always best.

Why This Soup Has Become a Go-To

I make this when I want something filling but feel like I’ve been eating nothing but cheese and crackers for a week straight (just me?). My family grabs second (sometimes third, oops) servings every time. It’s one of those soups that gets better after a day in the fridge—if it makes it that long. The split peas thicken it up just right, and that bright hit of vinegar? Totally brings the whole thing together. Weirdly, I once forgot the parsley but sort of loved the very earthy version that happened by accident. It’s flexible—like my favorite pajamas.

What You’ll Need

2 tbsp olive oil (I sometimes swap in a glug of avocado oil if I’m feeling fancy; my grandmother swore by regular olive oil and wouldn’t hear of anything else—it’s up to you!)
2 cups carrots, julienned (I use baby carrots when I’m in a rush, no one’s noticed yet)
1 cup celery, diced
3/4 cup onion, diced (yellow, red, even shallots if that’s what’s rolling around your veggie bin)
8 cloves garlic, minced (I love garlic, but if you’ve only got 6, no one’s ever tasted the difference)
10 cups low-sodium chicken broth—or vegetable stock if you want it fully veggie (sometimes I do half and half if I have open cartons…)
1 tbsp herbes de Provence (dried Italian seasoning works in a pinch, not that I’m confessing to anything)
1 1/2 tsp kosher sea salt
1/4 tsp ground black pepper
1/4 tsp paprika
1 sprig rosemary (fresh feels fancy, but dried is fine if you’re a bit short)
2 tsp white vinegar—or red wine vinegar works too (I actually think red wine brings more zing, but both do the trick)
1/2 cup yellow split peas
1/2 cup green split peas
1 cup green lentils
2 cups butternut squash, cubed (feel free to use pre-diced, I do when squash threatens to take a finger)
1 cup potatoes, cubed (any kind, honestly—I’ve used russet, yukon, even that lone red one hiding in the drawer)
1 cup celery root, cubed (don’t sweat it if you can’t find this, but it’s worth trying at least once!)
1/4 cup olive oil (extra for blending—adds richness, but you can skip if you’re watching oil)
2 cups kale, chopped (or spinach, arugula, greens of your choosing, I’ve raided the salad drawer more than once)
1/4 cup fresh parsley, chopped (I’ve forgotten it, like I said; but it definitely adds brightness)
1/4 cup Parmesan cheese, grated or shaved, optional (but very, very good—unless you’re vegan, in which case, skip it or use a substitute)

How To Make This Soup

Grab your largest pot (mine’s an ancient Dutch oven with slightly wonky handles). Splash in 2 tablespoons of olive oil and set over medium heat. Once you see a little shimmer, toss in the diced celery, onion, and all those carrots. Give them a good stir and let them soften for about 3 or 4 minutes. Add in the garlic—breathe in that aroma!—and cook for another minute, just until it begins to perfume everything. (Don’t let the garlic brown, or, in my case, forget about it entirely… burnt garlic is nobody’s friend.)
Now, pour in the chicken broth (or veggie stock) and crank the heat up to medium high. The goal: get it bubbling gently. Once you’re there, throw in the herbes de Provence, salt, pepper, paprika, rosemary sprig, and vinegar. Then tip in both split peas and the green lentils. Stir, lower the heat to an easy simmer, and leave it uncovered for 30 minutes. This is the step when I usually clean up the carrot shavings I somehow flung across the counter. Give it an occasional stir and watch for sticking stuff at the bottom.
After half an hour has sauntered by, tip in the butternut squash, potatoes, and celery root. Keep at that gentle simmer—no need to rush here—for another 30 minutes. Don’t fret if things look a bit crowded; it’ll all soften and meld together. Take a taste (careful, it’s lava-hot) to check the peas are properly cooked. They should be soft but not dissolving.
Here’s my favorite bit: carefully scoop out about four cups of the soup (broth, veg, peas, everything) and add it to a blender with the extra 1/4 cup of olive oil. Blitz until super smooth and creamy—makes the final soup rich without any cream. Pour this right back into your main pot and stir through. Toss in chopped kale, parsley, and, if you like, all that lovely Parmesan. I let it simmer on low for just another 5 to 8 minutes. (The kale softens, and the cheese simply disappears into it—magic!)
Take off the heat. Let it rest five minutes—that’s when I usually sneak another spoonful and inevitably burn my tongue. And then: grab your favorite bowl, and dig in!

A Few Notes From Someone Who’s Made This Too Many Times

If you use pre-chopped butternut squash, good call. Your knuckles will thank you.
Watch salt if your broth isn’t low-sodium. I have had one too many almost-too-salty soups before remembering this, oops.
The blended soup step is messy but worth it. Spill a bit? It happens. Just wipe it up—no one’s judging.

Variations I’ve Tried—Plus One Epic Fail

Swapped kale for baby spinach—tender and delicious, but the color goes a bit pale. Not bad though!
Added a diced jalapeño once for heat (forgot to warn my dad—he noticed!)
One time, I tried using only lentils, skipping split peas. It was…fine. But not as hearty; the version below honestly works best.

Do You Need Fancy Equipment?

If you have a blender, use it! If not, use a hand-held immersion stick, or even a potato masher for a chunkier soup. I’ve resorted to just mashing against the side of the pot with a wooden spoon—kitchen DIY at its best.

Storing Leftovers (If You’re Lucky)

Let it cool down, pop it in a big container, and stash it in the fridge. Good for 3 days, though honestly, it never lasts that long at my place. You can freeze it, but I find the veggies go mushy after thawing—still tasty, just, you know, a little homely-looking.

How I Like To Serve It

With crusty bread. Or better yet, garlic toast (the store-bought kind if I’m tired, but homemade if I’m out to impress). Occasionally, I’ll sprinkle extra cheese on top and pretend it’s a fancy French bistro at home. Sunday lunch tradition in our family is to serve this with a little green salad like we’re very healthy people.

Lessons Learned – My Soup Mishaps

I once rushed the blending step and ended up with half-smooth, half-chunky soup. Not my finest culinary hour! Take the time (but no need to go wild).
Letting it rest those 5 minutes? Actually makes it taste better—the flavors seem to settle (or maybe I’m just hungry by then).

Some Questions I’ve Actually Gotten

Can I make it vegan? Totally! Use vegetable broth and skip the Parmesan (or swap in one of those vegan cheeses, but I haven’t found one I truly love yet. Still trying…)
Do I need split peas and lentils both? Well, you can technically just use one or the other, but the mix is what gives it that not-quite-chili, not-quite-stew vibe. It’s worth grabbing both if you can.
What if I don’t have herbes de Provence? Any mixed dried Italian herbs will do, or just use thyme plus a pinch of oregano. Eh, sometimes I just use whatever’s left in the spice jar.
Can I make it ahead? Yep, and I think it even tastes better on day two, though it’ll thicken—just stir in a splash of water or broth before reheating.
Is it okay to skip celery root? You don’t have to include it. But if you can find it, it’s a neat twist—almost a nutty flavor. But don’t stress if it’s AWOL at your market.