Cajun Dirty Spaghetti Recipe

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If you've been seeing "dirty spaghetti" everywhere and wondering what it actually is — you're about to find out, and you're not going to be disappointed.

This is not your regular weeknight spaghetti. This is spaghetti that sat next to a pot of dirty rice at a Louisiana cookout and took notes. Ground beef and andouille sausage, bell peppers and onion cooked down in the fat, tomato paste and Cajun seasoning bloomed together until the whole pan smells like something serious is happening. Then broth, fresh tomatoes, and Worcestershire go in, the pasta gets tossed right into the sauce, and you finish it with green onions and a squeeze of lemon.

It's one of those recipes that sounds fancy when you describe it and takes 30 minutes start to finish. We love that for us.

Why you'll love this recipe

• One deep skillet. One pot of pasta water. That's it for dishes.

• The andouille sausage does most of the heavy lifting on flavor — the rest just has to show up.

• Fresh tomatoes and lemon keep it from feeling heavy, even in summer.

• It reheats beautifully, which means lunch tomorrow is already handled.

Ingredients

• 1 lb ground beef

• ½ lb andouille sausage, sliced into ¼-inch rounds— find it near the smoked sausages; kielbasa works in a pinch but andouille gives you that smoky, spicy depth

• 1 small onion, diced

• 1 green bell pepper, diced

• 1 red bell pepper, diced

• 4 cloves garlic, minced

• 2 tablespoons tomato paste

• 1½ teaspoons Cajun seasoning — Tony Chachere's or Slap Ya Mama are both great; taste your brand first, some run salty

• ¼ teaspoon cayenne, optional — skip it if your Cajun seasoning is already spicy, add it if you want real heat

• 2 cups beef broth

• 1 cup cherry tomatoes, halved

• 12 oz spaghetti

• 1 tablespoon Worcestershire sauce

• Salt to taste

• Sliced green onions and chopped parsley to finish

• Lemon wedges for serving

Instructions

1. Bring a large pot of salted water to a boil and cook the spaghetti until al dente. Before you drain it, scoop out about ½ cup of the pasta water and set it aside — you might need it.

2. While the pasta cooks, heat a large deep skillet over medium-high. Add the ground beef and andouille. Cook until browned, breaking the beef up as it goes. The andouille will render out some fat and that's a good thing — that's flavor in the pan.

3. Add the onion and bell peppers. Cook 4 to 5 minutes, stirring occasionally, until softened and starting to get a little color.

4. Add the garlic. Cook 30 seconds until fragrant.

5. Push everything to the edges of the pan and add the tomato paste to the center. Let it sit for 30 seconds, then stir it all together with the Cajun seasoning and cayenne if using. Cook 1 to 2 minutes — you want the tomato paste to go from bright red to a deeper brick color. This step is where the sauce gets its depth, don't rush it.

6. Pour in the beef broth, Worcestershire sauce, and cherry tomatoes. Stir everything together and bring to a gentle simmer. Let it cook for 2 to 3 minutes.

7. Add the drained spaghetti and toss well to coat. If the sauce looks tight, add a splash of that reserved pasta water. Cook 1 to 2 more minutes so the pasta absorbs the sauce and everything is glossy and together.

8. Taste and add salt if needed. Finish with green onions, parsley, and a good squeeze of lemon right before serving.

Yes, the Cajun seasoning is doing the work here — no need for garlic powder, onion powder, and paprika separately. A good Cajun blend already has all of that plus the right balance of heat. Just make sure you're using 1½ teaspoons, not 1. One teaspoon disappears in a pound of meat.

Tips and variations

Make it spicier

Add the full ¼ teaspoon cayenne plus a splash of hot sauce when you add the broth. If you want serious heat, use a spicy andouille and let the rest build from there.

No andouille?

Kielbasa is the closest substitute. Regular Italian sausage (hot) will work but it'll lean more Italian than Cajun. Still delicious, just a different vibe.

Make it lighter for summer

Use 2½ cups broth instead of 2 and let the sauce stay a little looser. The lemon squeeze at the end is non-negotiable if you're serving this warm-weather style — it brightens the whole dish.

Storage and reheating

Keeps in the fridge for up to 4 days. Reheat in a skillet with a splash of broth or water to loosen the sauce back up. Do not microwave it dry — it deserves better than that.

What to serve with dirty spaghetti

• A simple green salad with lemon vinaigrette — the bright acid balances the richness (Try this Blueberry Peach Arugula Salad with Honey Lime Vinaigrette)

• Crusty garlic bread (obviously)

• Extra cherry tomatoes tossed on top right before serving for color and freshness

• Hot sauce on the table for the people who want to go for it

Frequently asked questions

What is dirty spaghetti?

Dirty spaghetti is a bold, heavily seasoned pasta dish inspired by Cajun dirty rice — where you cook meat, aromatics, and spices together into a rich, savory sauce and then toss pasta in it. The "dirty" just means deeply flavorful, spiced, and unapologetically not a red sauce situation.

Can I use just ground beef and skip the andouille?

You can, but the andouille is where most of the smoky, spicy depth comes from. If you skip it, add an extra ½ teaspoon of Cajun seasoning and a little smoked paprika to compensate.

Can I make this ahead?

Yes — make the sauce ahead and cook the pasta fresh. Combine right before serving. The sauce holds in the fridge for 3 days and actually gets better overnight.

Is this kid-friendly?

Skip the cayenne and start with 1 teaspoon of Cajun seasoning instead of 1½. It'll be mild but still flavorful. You know your kids — taste the sauce before you add the pasta and adjust from there.

Made this? Leave a comment below and let me know how it went — and if you added extra cayenne, respect. Friends are always welcome to the Saucy Kitchen.