A Cajun cream sauce made slowly in a crock, with shrimp added right at the end and pasta folded through off the heat.
Three hours in total, of which the shrimp accounts for twenty minutes and the pasta for ten.
Why This Recipe Works
- Cooking the peppers and onion for two and a half hours in broth and butter builds a base with real depth, which is what a fast shrimp pasta on the hob never has time for.
- Draining the fire-roasted tomatoes matters — the recipe already has a cup of broth and a cup of cream, and the canning liquid would thin a sauce meant to coat.
- Splitting the Cajun seasoning between the shrimp and the sauce seasons the protein directly rather than relying on the sauce to do it, which is why the shrimp tastes of more than the pot it finished in.
- Cooking the pasta separately and folding it in at the end keeps it al dente. Pasta cooked in a slow cooker sauce goes soft and releases starch that thickens things unpredictably.
Sauce Slowly, Shrimp Quickly
A slow cooker is exactly the wrong tool for shrimp and exactly the right one for a Cajun cream sauce. The recipe solves that by keeping them apart for two and a half hours and letting them meet for twenty minutes.
In the slow cooker
- From the start, 2 1/2 hours on Low
Butter, oil, onion, bell pepper, garlic, broth, drained fire-roasted tomatoes and the dry seasonings, until the peppers are tender and aromatic. Nothing here can overcook.
- Then 15 minutes
Heavy cream, cream cheese and Parmesan whisked in and cooked briefly, then stirred silky. The dairy arrives only once the vegetables are done, so it spends the shortest possible time at heat.
- Optionally 5 to 10 more
A cornstarch slurry if you want the sauce thicker. It is the last adjustment before the shrimp goes anywhere near the pot.
In the fridge, then a pot
- At minute one
Shrimp patted dry, tossed with a teaspoon of Cajun seasoning and pepper, and refrigerated. It does nothing for two and a half hours and that is correct.
- While the dairy cooks
Pasta boiled in salted water to just al dente and drained. It finishes in the sauce, so pulling it early is deliberate.
Fifteen to twenty minutes, then off the heat
The shrimp goes into the finished sauce on High for 15 to 20 minutes, just until pink and curled — those two words are the doneness test, not a time. Then the pasta and lemon juice are stirred through and it is served immediately, because shrimp left in a hot crock keeps cooking and goes rubbery.
Ingredient Notes
- Large shrimp
- A pound, peeled and deveined. Large rather than small — small shrimp overcook inside the 15 to 20 minute window this recipe allows.
- Cajun seasoning, divided
- A tablespoon total, split between the shrimp and the sauce. Blends vary a lot in salt, which is why the recipe adds no separate salt until the end.
- Fire-roasted diced tomatoes, drained
- A 14.5 oz can, and drained is specified. The char is worth seeking out; the liquid is not wanted in a sauce this rich.
- Freshly grated Parmesan
- Three quarters of a cup. Grate it yourself — pre-grated carries starch that shows as grit in a cream sauce.
How to Make It
Season the shrimp and chill it
Pat the shrimp dry, toss with 1 teaspoon of Cajun seasoning and a pinch of black pepper, and refrigerate while the sauce cooks.
Start the sauce
Add the butter, olive oil, onion, bell pepper, garlic, broth, drained tomatoes, smoked paprika, garlic powder, onion powder and remaining Cajun seasoning to the slow cooker and stir to combine.
Cook the base
Cover and cook on Low for 2 1/2 hours, or High for about 1 1/2, until the peppers are tender and aromatic.
Add the dairy
Whisk in the heavy cream, cream cheese and Parmesan. Cover and cook 15 minutes, then stir until silky. For a thicker sauce, stir in the cornstarch slurry and cook 5 to 10 minutes more.
Cook the pasta
Meanwhile, cook the pasta in salted water until just al dente, then drain and reserve.
Cook the shrimp
Add the shrimp to the slow cooker and cook on High 15 to 20 minutes, just until pink and curled.
Combine and serve
Stir in the pasta and lemon juice, season to taste, garnish with parsley and serve immediately.
Success Tips
- Keep the seasoned shrimp in the fridge until its moment.
- Drain the tomatoes.
- Pull the pasta at just al dente; it finishes in the sauce.
- Watch for pink and curled and then serve. Shrimp in a hot crock does not wait.
Serving Ideas
Parsley and extra lemon, served immediately. This is not a dish to hold — the shrimp is the reason, and it goes from perfect to rubbery in the time a crock takes to cool.
Storage and Reheating
Refrigerate
Refrigerate up to 2 days, because of the shrimp. The pasta absorbs the sauce overnight.
Freeze
Not recommended. Cooked shrimp goes tough after freezing and a cream sauce with Parmesan in it separates.
Reheat
Very gently in a pan with a splash of cream or broth, and only until warm. Every second of reheating is more cooking for the shrimp.
Frequently Asked Questions
My shrimp came out rubbery.
It was in too long, or it sat in the hot sauce after cooking. Pink and curled is the endpoint and it arrives before the twenty minutes is up in many cookers. Serve straight away rather than holding it on Warm.
Can I use frozen shrimp?
Thaw it completely and pat it genuinely dry first. Shrimp added part-frozen releases water into the sauce you have just spent three hours thickening, and it also cooks unevenly in the short window.
How do I make it less spicy?
Leave out the optional cayenne and use two teaspoons of Cajun seasoning rather than a tablespoon, keeping the split between the shrimp and the sauce. The smoked paprika carries the colour and much of the flavour without the heat.
