Lasagna Soup exists because I kept asking a very practical question: can you get the flavor of a baked lasagna without assembling three layers and washing four pans? The answer, after several trials, is yes, mostly. You brown sausage, build a tomato broth, drop in broken noodles, and stir a ricotta-mozzarella mixture in at the bowl so it melts into something that reads like the top layer of a casserole.
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Here is where the trade-off matters. Baked lasagna has structure: clean slices, defined layers, a crust of cheese that browns under the broiler. Soup has none of that, but it has speed and a broth that carries the tomato and fennel into every spoonful. If you want a showpiece for a dinner party, bake the pan. If you want Tuesday dinner to taste like Sunday, make the soup.
One thing a pot cannot do is stay firm. Noodles keep drinking broth as they sit, so the texture you get at minute 12 is not the texture at minute 40. I cook the pasta just shy of al dente and keep extra stock on the counter to loosen bowls as I serve them. That small habit is the difference between soup and pasta porridge.
Why You'll Love This Recipe
About the Ingredients
1 lb (450g) Italian sausage, casings removed
Use hot or sweet depending on how much heat you want; ground turkey or a plant-based crumble works if you brown it well, though you will lose some of the pork fat that carries the fennel.
1 medium yellow onion, diced (about 1 1/2 cups / 200g)
Yellow onion gives the sweetness you want here; a red onion will work but turns the broth slightly pink and sharper.
4 cloves garlic, minced (about 1 tbsp)
Fresh garlic is worth it over jarred; if you only have garlic powder, add 1 teaspoon with the tomatoes instead of at the start so it does not scorch.
2 tbsp tomato paste
Fry it until it darkens to brick red; sun-dried tomato paste is a good swap if you want a deeper, sweeter note.
1 can (28 oz / 800g) crushed tomatoes
Crushed rather than diced gives a thicker broth; if using whole tomatoes, crush them by hand and expect a chunkier texture.
6 cups (1.4L) low-sodium chicken broth
Low-sodium matters because the parmesan rind and sausage both add salt; vegetable broth works for a lighter version.
1 parmesan rind (about 3 inches)
Ask the cheese counter for rinds, which are usually free; skip it and add 1/4 cup grated parmesan at the end instead.
8 oz (225g) lasagna noodles, broken into 1-inch pieces
Broken regular noodles hold up better than no-boil sheets, which go mushy fast; campanelle or mafaldine are good stand-ins.
1 tsp dried oregano and 1/2 tsp red pepper flakes
Oregano is the backbone herb here; crush it between your palms before adding so it releases more aroma.
1 cup (250g) whole-milk ricotta
Whole milk gives the creamiest dollop; cottage cheese blended smooth is a lower-fat swap that behaves similarly.
1 cup (100g) shredded low-moisture mozzarella
Low-moisture melts into strands rather than puddling; fresh mozzarella will water down the broth if stirred in.
1/4 cup (25g) grated parmesan, plus more for serving
Grate it yourself if you can; pre-shredded parmesan has starch that clumps instead of melting.
Tips & Tricks
Undercook the Noodles
Pull the pasta 2 minutes before the package time so it stays firm in the bowl; it keeps absorbing broth as it sits.
Keep Extra Broth Hot
Warm an extra cup of stock and add it to leftovers, because the noodles will have drunk the original broth overnight.
Brown the Sausage Properly
Let it sit untouched for 4 minutes before breaking it up; that crust is where most of the flavor in the broth comes from.
Season at the End
Taste after the parmesan goes in, since the rind and cheese bring salt you cannot predict at the start.
Pro Tips
Step-by-Step Instructions
1. Brown the sausage
Heat a Dutch oven over medium-high heat, about 400F (205C) on an infrared thermometer, and add the sausage in one layer. Cook 6 to 8 minutes without stirring until the underside is deeply browned, then break it up and cook 2 more minutes until no pink remains.
2. Soften the aromatics
Lower the heat to medium, about 350F (175C), and add the onion with a pinch of salt. Cook 5 minutes until translucent and soft at the edges, then stir in the garlic and oregano and cook 45 seconds until fragrant but not browned.
3. Fry the tomato paste
Push the vegetables aside and add the tomato paste to the hot pan. Cook 90 seconds, stirring, until it darkens from bright red to brick red and smells sweet rather than raw.
4. Build the broth
Pour in the crushed tomatoes and chicken broth, add the parmesan rind and red pepper flakes, and scrape the browned bits off the bottom. Bring to a simmer, about 200F (93C), then cover partly and cook 15 minutes so the flavors marry.
5. Cook the noodles
Add the broken lasagna noodles and stir so they do not stick. Simmer uncovered 10 to 12 minutes, stirring every 2 minutes, until the noodles are just shy of al dente and the broth has thickened slightly.
6. Mix the cheese topping
While the pasta cooks, stir together the ricotta, mozzarella, and grated parmesan in a small bowl. Leave it at room temperature so it melts into the hot soup instead of cooling it down.
7. Finish and taste
Fish out the parmesan rind and taste the broth. Add salt only if it needs it, and loosen with hot stock if the soup looks thicker than you want.
8. Serve with a dollop
Ladle into bowls and spoon a generous mound of the cheese mixture on top. Let it sit 1 minute to soften, then stir it in at the table so it streaks through the broth.
Delicious Variations
Spicy Arrabbiata Version
Swap the sweet sausage for hot Italian sausage and double the red pepper flakes for a broth with real bite.
Creamy White Lasagna Soup
Replace the crushed tomatoes with 1 cup of whole milk and use mild sausage for a paler, richer broth closer to Alfredo.
Vegetarian Mushroom Version
Use 12 oz of cremini mushrooms browned hard in place of the sausage and vegetable broth instead of chicken for a meaty texture without the meat.
How to Store Lasagna Soup
Refrigerator
Store in an airtight container up to 4 days, but keep leftover noodles separate if you can, since they keep softening in the broth.
Freezer
Freeze the broth base without the noodles or cheese for up to 3 months; add fresh cooked noodles when reheating.
Reheating
Warm gently on the stovetop over medium-low heat, about 300F (150C), adding a splash of stock or water and stirring until it loosens, about 5 minutes.
Frequently Asked Questions
Q: Can I use regular lasagna noodles instead of broken ones?
Yes, and they are actually the better choice for this soup. Break the dry sheets into 1-inch pieces with your hands before adding them, and avoid no-boil sheets, which turn soft and pasty very quickly.
Q: Why did my lasagna soup turn mushy?
The noodles overcooked in the hot broth, which keeps softening them even off the heat. Cook them 2 minutes under the package time and serve right away, or cook the pasta separately and add it to bowls.
Q: Can I make lasagna soup in a slow cooker?
Yes, but add the noodles at the end. Brown the sausage and aromatics on the stove first, put the broth base in the slow cooker on low for 4 hours, then stir in dry noodles for the last 30 minutes on high.
Q: How do I make lasagna soup vegetarian?
Swap the sausage for browned mushrooms or a plant-based crumble and use vegetable broth, then add an extra teaspoon of fennel seed to replace what the sausage brought. Skip the parmesan rind and use a vegetarian hard cheese instead.
Q: Is lasagna soup better the next day?
The broth tastes deeper the next day, but the noodles will be much softer. If you know you will have leftovers, cook the pasta separately and add it to each bowl so the broth stays loose.
Make it once with the noodles cooked just shy of done and the cheese dolloped at the table, and you will see why the pot beats the pan on a weeknight. Taste the broth before you salt it, and taste the noodles before you call them done. Test it before you trust it.
Lasagna Soup
Lasagna Soup delivers all the cheesy, saucy layers of lasagna in one pot, ready in under an hour with a fraction of the effort and no oven required.
🧂 Ingredients
- 1 lb (450g) Italian sausage, casings removed
- 1 medium yellow onion, diced (about 1 1/2 cups / 200g)
- 4 cloves garlic, minced (about 1 tbsp)
- 2 tbsp tomato paste
- 1 can (28 oz / 800g) crushed tomatoes
- 6 cups (1.4L) low-sodium chicken broth
- 1 parmesan rind (about 3 inches)
- 8 oz (225g) lasagna noodles, broken into 1-inch pieces
- 1 tsp dried oregano and 1/2 tsp red pepper flakes
- 1 cup (250g) whole-milk ricotta
- 1 cup (100g) shredded low-moisture mozzarella
- 1/4 cup (25g) grated parmesan, plus more for serving
📋 Instructions
- 1Brown the sausage — Heat a Dutch oven over medium-high heat, about 400F (205C) on an infrared thermometer, and add the sausage in one layer. Cook 6 to 8 minutes without stirring until the underside is deeply browned, then break it up and cook 2 more minutes until no pink remains.
- 2Soften the aromatics — Lower the heat to medium, about 350F (175C), and add the onion with a pinch of salt. Cook 5 minutes until translucent and soft at the edges, then stir in the garlic and oregano and cook 45 seconds until fragrant but not browned.
- 3Fry the tomato paste — Push the vegetables aside and add the tomato paste to the hot pan. Cook 90 seconds, stirring, until it darkens from bright red to brick red and smells sweet rather than raw.
- 4Build the broth — Pour in the crushed tomatoes and chicken broth, add the parmesan rind and red pepper flakes, and scrape the browned bits off the bottom. Bring to a simmer, about 200F (93C), then cover partly and cook 15 minutes so the flavors marry.
- 5Cook the noodles — Add the broken lasagna noodles and stir so they do not stick. Simmer uncovered 10 to 12 minutes, stirring every 2 minutes, until the noodles are just shy of al dente and the broth has thickened slightly.
- 6Mix the cheese topping — While the pasta cooks, stir together the ricotta, mozzarella, and grated parmesan in a small bowl. Leave it at room temperature so it melts into the hot soup instead of cooling it down.
- 7Finish and taste — Fish out the parmesan rind and taste the broth. Add salt only if it needs it, and loosen with hot stock if the soup looks thicker than you want.
- 8Serve with a dollop — Ladle into bowls and spoon a generous mound of the cheese mixture on top. Let it sit 1 minute to soften, then stir it in at the table so it streaks through the broth.
