You smell it before you see it. Smoky, spicy, a little bit sweet from the charring lemon. That's the scent of Cajun shrimp cooking in a foil packet over campfire coals. No pot to scrub. No cutting board to rinse. Just a packet you fold, cook, and eat from at the picnic table.

Why Foil Packets Work for Shrimp

Shrimp cook in minutes. That makes them perfect for foil packets, which trap steam and heat evenly. The trick is getting the timing right. Too long and shrimp turn rubbery. Too short and they're cold in the middle. With a hot bed of coals or a medium-high grill, 12 minutes total — flipping once at the halfway mark — gives you tender, juicy shrimp every time.

I keep the ratio at 6 ounces of shrimp per person, plus 2 ounces of sausage for flavor and fat. The sausage also acts as a heat sink, helping the packet cook evenly. That's my non-commodity tip: don't skip the sausage. It prevents the shrimp from overcooking on the bottom of the packet.

Build Your Cajun Spice Blend

You can use a store-bought Cajun seasoning, but I prefer to mix my own at the campsite. It takes 30 seconds and lets you control the salt and heat. Here's the ratio I use for 1.5 pounds of shrimp:

• 2 teaspoons Cajun seasoning (or make it with paprika, garlic powder, onion powder, oregano, thyme, cayenne, and black pepper)
• 1/2 teaspoon smoked paprika for depth
• 1/4 teaspoon cayenne if you want real heat
• 1/2 teaspoon garlic powder and 1/2 teaspoon onion powder (adds savory base)
• 1/4 teaspoon black pepper and 1/4 teaspoon salt (adjust if your seasoning has salt)

Mix these in a small bowl or a zip-top bag. Toss the shrimp with olive oil first — the oil helps the spices stick and prevents sticking to the foil.

Picking and Prepping the Shrimp

Large shrimp, 21-25 count per pound, are ideal. They're big enough to not dry out but small enough to cook through in the packet. Buy them peeled and deveined to save time at camp. If you can only find shell-on, peel them at home before you leave. Pack them in a zip-top bag in the cooler with ice.

Pat the shrimp dry with a paper towel. This is a small step that makes a big difference. Wet shrimp create steam inside the packet, which can make the spice blend slide off. Dry shrimp hold the seasoning and develop a slight sear where they touch the foil.

Assembling the Packets

Use heavy-duty foil. Regular foil tears too easily on hot coals. Tear off four 18-inch sheets. Spray the center of each with nonstick cooking spray or rub with a little oil. This prevents sticking, especially if you're using butter.

Layer in this order: sausage first, then shrimp in a single layer, then lemon slices, then a pat of butter on top. The butter melts and bastes the shrimp as they cook. The lemon slices soften and release juice that cuts through the richness.

Fold the foil tightly. Bring the two long sides together and fold over twice, pressing down firmly. Then fold each short end in toward the center. You want a sealed packet with a little air space inside — that air becomes steam and cooks the shrimp evenly.

Cooking Over Fire, Grill, or Stove

Campfire

Build a fire and let it burn down to hot coals. Rake a bed of coals to one side. Place the packets directly on the coals. Cook for 6 minutes, then use tongs and heatproof gloves to flip each packet. Cook another 5-6 minutes. The foil will be blackened on the outside — that's normal. The inside stays clean.

Grill

Preheat a gas or charcoal grill to medium-high, about 400°F. Place packets on the grates, cover, and cook 6 minutes per side. The indirect heat from the grill lid cooks more gently than direct coals, so you may need an extra minute per side if the shrimp look translucent when you open a packet.

Camp Stove

Use a large skillet or flat griddle. Place the packets in the skillet over medium heat. Cook 6 minutes per side, pressing down gently with a spatula to ensure good contact. This method takes a little longer because the heat is less intense than coals or a grill.

When Are They Done?

Open one packet carefully — steam will rush out, so angle it away from your face. The shrimp should be pink and opaque all the way through, with a slight curl. The sausage should be hot and sizzling. If the shrimp are still gray or translucent, reseal the packet and cook 1-2 more minutes. If they're curled into tight circles, they're overdone.

For food safety: shrimp are safe when they reach an internal temperature of 120°F, but they continue cooking after you pull them off the heat. I pull the packets at 115°F and let them rest for 2 minutes. The carryover heat finishes the job.

Serving Ideas

Eat straight from the packet — that's the easiest camp meal. Or spoon the shrimp and sausage over instant grits, rice, or crusty bread. The juices in the packet are liquid gold. Pour them over your starch. A sprinkle of fresh parsley or green onion adds color but isn't necessary.

Common Mistakes to Avoid

• Overcrowding: Shrimp need a single layer to cook evenly. If you double the recipe, make more packets, not bigger ones.
• Skipping the flip: Flipping the packet halfway through ensures even cooking. The bottom gets more heat, so flipping redistributes it.
• Using thin foil: Regular foil tears on hot coals. Heavy-duty or extra-wide foil holds up to the heat and the flip.

Takeaway

Foil packet Cajun shrimp is the kind of camp meal that feels like a treat but takes almost no work. The smoky spice, the tender shrimp, the juicy lemon — it all comes together in a sealed packet over fire. Learn the timing, respect the flip, and you'll have a dinner that makes everyone at the picnic table lean in for another bite.

Frequently Asked Questions

Can I use frozen shrimp for this recipe?

Yes, but thaw them first. Place frozen shrimp in a sealed bag and submerge in cool water for 10-15 minutes, changing the water once. Pat them very dry before seasoning, or the packet will be watery and the shrimp will steam instead of sear.

How do I keep the shrimp from getting rubbery?

Don't overcook. Shrimp cook fast — in a foil packet over hot coals, they're done in 10-12 minutes total. Check one packet at the 10-minute mark. The shrimp should be opaque, pink, and just firm to the touch. If they curl into a tight C shape, they're overdone.

What if I don't have andouille sausage?

Use any smoked sausage like kielbasa or chorizo. The key is a smoky, fully cooked sausage that adds flavor to the shrimp. If using raw sausage, cook it through before adding to the packet.

Can I add vegetables to the packet?

Absolutely. Add bell pepper strips, sliced okra, or diced onion. Cut them thin (1/4-inch) so they cook in the same time as the shrimp. Add them to the packet with the sausage, before the shrimp.