Name: Cheesy Keto Lasagna Soup
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Cuisine: American
Ingredients: 1 tablespoon avocado or vegetable oil; 1 pound Italian beef sausage (ground); ½ pound ground beef; 1 onion (diced); 6 cloves garlic (minced); 1 (14 oz can) crushed tomatoes; 1 (6 oz can) tomato paste; 1 (14 oz can) tomato sauce; 2 1/2 cups chicken broth (low sodium); 1 teaspoon fennel seeds; 2 teaspoons Italian seasoning; 1 1/2 teaspoons Kosher salt; ½ teaspoon black pepper; 8 oz mozzarella (shredded); ½ cup Parmesan cheese (grated); 1/2 cup fresh parsley (chopped)

This low-carb lasagna soup provides a rich, comforting meal without the use of traditional pasta. It combines savory meats and a blend of cheeses into a thick, hearty broth.

List of ingredients

1 tablespoon avocado or vegetable oil – used for sautéing the base aromatics.
1 pound Italian-style beef sausage (ground) – provides the primary savory flavor.
1/2 pound ground beef – adds density and heartiness to the soup.
1 onion (diced) – adds a sweet, aromatic base.
6 cloves garlic (minced) – provides pungent depth.
1 (14 oz can) crushed tomatoes – creates a thick, chunky texture.
1 (6 oz can) tomato paste – concentrates the tomato flavor and thickens the liquid.
1 (14 oz can) tomato sauce – ensures a smooth consistency.
2 1/2 cups chicken broth (low sodium) – provides the soup base.
1 teaspoon fennel seeds – mimics the traditional taste of Italian sausage.
2 teaspoons Italian seasoning – a blend of dried herbs for authentic flavor.
1 1/2 teaspoons Kosher salt – enhances all other ingredients.
1/2 teaspoon black pepper – adds a mild spicy kick.
8 oz mozzarella (shredded) – creates the classic melted cheese pull.
1/2 cup Parmesan cheese (grated) – adds a salty, nutty finish.
1/2 cup fresh parsley (chopped) – adds a bright, fresh contrast.

step-by-step instructions

Brown the Meat: Heat the oil in a large, heavy-bottomed pot over medium-high heat until it shimmers. Add the ground beef sausage, ground beef, and diced onions, cooking for approximately 8 minutes until the meat is fully browned and the onions become translucent.
Sauté the Aromatics: Stir in the minced garlic and cook for an additional 1 to 2 minutes, ensuring the garlic is fragrant but not burnt.
Simmer the Base: Stir in the tomato paste, crushed tomatoes, tomato sauce, chicken broth, Italian seasoning, salt, pepper, and fennel seeds. Bring the mixture to a boil, then immediately reduce the heat to a simmer for 20 minutes to allow the flavors to meld.
Incorporate the Cheese: Remove the pot from the heat source. Stir in the shredded mozzarella, grated Parmesan, and chopped parsley, stirring continuously until the cheese has completely melted into the broth.

Low-Carb Noodle Alternatives

Using Zucchini Noodles

To include zucchini noodles, completely remove the soup from the heat before stirring them in. Zucchini releases a significant amount of water and softens very quickly. Using a spiralizer or a mandolin allows you to create ribbons that resemble lasagna sheets without overcooking them into a mushy texture.

Preparing Spaghetti Squash

Spaghetti squash should be fully cooked in the oven or microwave before being added to the soup. Roast the squash until the strands are tender but still hold their shape. Fold the cooked strands into the soup at the very end to maintain an al dente texture, as the residual heat of the broth will continue to soften the squash.

Incorporating Butternut Squash Noodles

Add butternut squash noodles during the final three minutes of simmering. Because these noodles are denser than zucchini, they require a small amount of active heat to tenderize. Remove the soup from the heat while the noodles still have a slight bite to avoid them disintegrating into the sauce.

Using Shredded Cabbage

Finely shredded cabbage can serve as a crunchy, low-carb noodle substitute. Add the cabbage after the soup has been removed from the heat. The heat of the broth will wilt the cabbage slightly while preserving a texture that provides a satisfying contrast to the creamy cheese.

Adding Almond Flour Pasta

Almond flour pasta is often more fragile than traditional wheat pasta. It is recommended to boil the pasta separately according to the package instructions before folding it into the finished soup. This prevents the pasta from breaking apart or absorbing too much of the broth during the simmering process.

Protein Customizations and Substitutions

Substituting with Ground Turkey

If you prefer a leaner profile, replace the ground beef and beef sausage with ground turkey. Since turkey has less fat, you may need to increase the amount of avocado oil used for sautéing to prevent the meat from sticking to the pot. Season the turkey with extra fennel seeds to maintain the traditional Italian flavor profile.

Creating a Vegetarian Version

To make this soup vegetarian, omit the beef and sausage entirely. Increase the amount of diced onion and add diced carrots and celery to provide a similar heartiness and depth of flavor. Use a vegetable-based broth instead of chicken broth to ensure the dish is entirely plant-based before adding the cheese.

Using Pre-made Keto Meatballs

For a different texture, use cooked keto-friendly meatballs instead of ground meat. Brown the meatballs in the pot first to develop a crust, then follow the recipe steps for the vegetables and liquids. The meatballs stay intact during the simmer, providing substantial bites of protein throughout the soup.

Essential Cooking Tips for Best Results

Proper Meat Browning Techniques

Ensure the pot is sufficiently hot before adding the meat to achieve a deep brown sear. Browning the meat creates a Maillard reaction, which adds a complex, savory depth that cannot be achieved by simply steaming the meat in its own juices. Drain excess fat if necessary, but leave a small amount to help sauté the onions.

Controlling the Simmer

When simmering the soup for 20 minutes, maintain a gentle bubble rather than a rolling boil. A high boil can cause the tomato-based broth to evaporate too quickly, leading to an overly thick or salty consistency. A slow simmer allows the fennel seeds and Italian herbs to infuse the liquid thoroughly.

Preventing Cheese Clumping

Always remove the soup from the heat before adding the mozzarella and Parmesan. Adding cheese to boiling liquid can cause the proteins to separate, resulting in clumps of cheese or an oily layer on top. Stirring the cheese in off-heat ensures a smooth, creamy integration into the broth.

Storage and Meal Prep Advice

Refrigeration Guidelines

Store leftovers in an airtight container in the refrigerator for up to four days. Because the soup contains a high volume of cheese, it will thicken significantly as it cools. When storing, keep fresh parsley separate and sprinkle it on top only after the soup has been reheated to maintain the herb’s bright color and flavor.

Freezing Instructions

To freeze this soup, use airtight plastic containers or glass jars, leaving at least an inch of headspace at the top. Liquids expand when frozen, and filling the container to the brim can cause the lid to pop or the glass to crack. For the best texture, freeze the soup before adding the fresh parsley.

Effective Reheating Methods

Reheat the soup on the stove over medium-low heat, stirring frequently to redistribute the melted cheese. If using a microwave, place a damp paper towel over the bowl to prevent the cheese and tomato sauce from splattering. Add a splash of chicken broth if the soup has become too thick during storage.

Serving Suggestions

Pairing with Low-Carb Sides

Serve the soup alongside a crisp garden salad with a lemon-olive oil vinaigrette to balance the richness of the cheese. Alternatively, a platter of roasted broccoli or cauliflower provides a complementary flavor and adds more nutrients to the meal.

Using Keto-Friendly Bread

Pair the soup with a toasted slice of almond flour or coconut flour bread. The bread is ideal for dipping into the thick broth and scooping up the melted mozzarella. Brushing the bread with garlic butter before toasting enhances the overall Italian theme of the meal.

Troubleshooting Common Issues

Fixing a Soup That Is Too Thick

If the soup becomes too thick due to the tomato paste or excessive simmering, stir in additional low-sodium chicken broth one quarter-cup at a time. Continue stirring until the desired consistency is reached. This is especially common when using higher-fat meats that may emulsify with the tomato base.

Adjusting a Watery Consistency

If the soup feels too thin, simmer it uncovered for an additional 10 to 15 minutes to reduce the liquid. You can also stir in an extra tablespoon of tomato paste, which acts as a natural thickener. Avoid adding more cheese to fix thickness, as this may make the soup overly salty.

Managing Overcooked Vegetables

If adding vegetable noodles, avoid cooking them inside the pot for the full 20-minute simmer. This prevents the zucchini or squash from becoming translucent and mushy. Always introduce these elements at the very end of the cooking process to ensure they retain their structural integrity.

Frequently Asked Questions

Is this recipe suitable for a strict keto diet?

Yes, this recipe is designed to be low-carb and keto-friendly by removing the pasta. It relies on healthy fats from oil and cheese and high-quality proteins to keep net carbohydrates low while maintaining satiety.

How can I make this soup paleo-friendly?

To modify this recipe for a paleo diet, omit the mozzarella and Parmesan cheeses. You can replace them with a splash of coconut cream or a cashew-based cream to achieve a similar richness without using dairy products.

Can I use a slow cooker for this recipe?

While this is a stovetop recipe, you can adapt it for a slow cooker by browning the meat and onions first. Combine all ingredients except the cheese and parsley in the crockpot and cook on low for 6 to 8 hours, stirring in the cheese just before serving.

What is the best way to substitute fennel seeds?

If you do not have fennel seeds, you can use a small amount of ground coriander or a pinch of anise powder. However, fennel is the key ingredient that provides the specific ‘Italian sausage’ flavor, so using a substitute may slightly alter the traditional taste profile.