Cajun Marinade for Prawns — Easy BBQ Recipe

Name: BBQ Cajun Prawns Marinade
Cook time: 30 min
Yield: 2-4 servings
Cuisine: Australian
Ingredients: Cajun Prawns Marinade; Salt; Black pepper; Olive oil

By Bill Ohaire | Published: April 2026 | Last Updated: April 2026

Flavourful BBQ marinade with fresh herbs

Photo by Jonathan Borba on Pexels

Quick Answer

Cajun Prawns Marinade: Combine 3 tbsp olive oil, 2 tbsp Cajun seasoning (or: 1 tsp paprika, 1 tsp garlic powder, and more. Marinate 15-30 minutes. Grill until internal temp reaches 63°C (145°F) — opaque and pink.

About This Marinade

This cajun marinade brings a bold, spicy, Southern American warmth flavour profile to your prawns. Adjust cayenne to your heat preference. The blend of paprika, garlic, and onion creates a flavour base that works on almost anything.

Prep Time

5 minutes

Marinate Time

15-30 min

Flavour Profile

bold, spicy, Southern American warmth

Best Cuts

king prawns (shell-on or peeled), tiger prawns

Ingredients

Ingredient	Amount
olive oil	3 tbsp
Cajun seasoning (or: 1 tsp paprika	2 tbsp
garlic powder	1 tsp
onion powder	1 tsp
cayenne	1/2 tsp
oregano	1/2 tsp
thyme	1/2 tsp
black pepper	1/2 tsp
white pepper)	1/2 tsp
lemon juice	2 tbsp
garlic (minced)	2 cloves

Prawns cook fast and absorb flavour fast. NEVER marinate prawns longer than 30 minutes in acidic marinades — the acid will start "cooking" them and they'll turn rubbery.

How to Make Cajun Prawns Marinade

Combine: Mix all marinade ingredients in a bowl or ziplock bag until well combined.
Prep the prawns: Pat the prawns dry with paper towel. Peel and devein if desired, or leave shell on for extra flavour.
Marinate: Add the prawns to the marinade, making sure every piece is well coated. Refrigerate for 15-30 minutes (no longer!).
Bring to temp: Remove from the fridge 20-30 minutes before cooking to take the chill off.
BBQ: Shake off excess marinade and grill over high heat (220-250°C / 425-480°F) until the internal temperature reaches 63°C (145°F) — opaque and pink.
Rest: Let the prawns rest for 1-2 minutes before serving.

Tips for the Best Cajun Prawns

Don't skip the rest — resting allows the juices to redistribute for a juicier result.
Watch the clock — prawns go from perfect to rubbery in seconds. Pull them off the moment they turn pink and opaque.
Reserve some marinade — set aside a portion before adding raw meat to use as a finishing sauce or baste.
Oil the grates — clean, oiled grates prevent sticking and give you better grill marks.

Common Mistakes to Avoid

Marinating too long in acid — more than 30 minutes will start chemically "cooking" the prawns, making them mushy.
Grilling straight from the fridge — cold meat doesn't cook evenly. Let it come to room temperature first.
Using the same marinade as a sauce — never reuse marinade that has touched raw meat. Always reserve a clean portion first.
Overcrowding the BBQ — give each piece space so it sears rather than steams.

Best Prawns Cuts for Cajun Marinade

The best cuts of prawns for this marinade are: king prawns (shell-on or peeled), tiger prawns.

King prawns and tiger prawns are ideal — they're large enough to handle on the BBQ and have a sweet, firm flesh that stands up to bold flavours.

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Frequently Asked Questions

How long should I marinate prawns in cajun marinade?

Marinate prawns in cajun marinade for 15-30 minutes maximum. Any longer and the acid will start breaking down the delicate flesh.

Can I use cajun marinade on other meats?

Yes! Cajun marinade works well on chicken and beef too. Adjust the marinating time based on the protein — delicate proteins need less time.

Should I marinate prawns in the fridge or at room temperature?

Always marinate in the fridge for food safety. Bacteria multiply rapidly at room temperature. Take the meat out 20-30 minutes before cooking to take the chill off for more even cooking.

What temperature should I BBQ cajun marinated prawns?

Grill cajun marinated prawns over high heat (220-250°C / 425-480°F). Cook until the internal temperature reaches 63°C (145°F) — opaque and pink.

Related BBQ Guides

Beer Prawns Marinade Citrus Prawns Marinade Soy & Garlic Prawns Marinade Cajun Chicken Marinade Cajun Beef Marinade All Cooking Times

Sources & References

How to BBQ Right (YouTube)

Malcom Reed's seafood smoking and grilling tutorials.

Video

Serious Eats

Kenji Lopez-Alt's science of grilling fish without sticking.

Reference

Mad Scientist BBQ (YouTube)

Seafood BBQ experiments with detailed cook logs.

Video

Weber Grill Skills

Weber Australia's guide to grilling seafood on the BBQ.

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