How to butterfly and grill shrimp without overcooking

Shrimp on the grill should be smoky, juicy, and tender. Instead, most people end up with grey rubber bands that taste like lighter fluid. The problem is twofold: shrimp curl into tight little C-shapes on the grill, cooking unevenly, and they go from perfect to overcooked in about 15 seconds.

Butterflying solves both problems. You cut the shrimp almost in half lengthwise, opening it up like a book. This keeps it flat on the grill, gives you twice the surface area for char, and lets heat penetrate evenly so the inside cooks at the same rate as the outside. It takes about 30 seconds per shrimp once you get the hang of it.

Why butterfly instead of skewering#

Skewering shrimp straight through the body works fine if you're okay with mediocre results. The shrimp still curls slightly, the inside stays translucent longer than the outside, and you get char on only one side unless you flip carefully.

Butterflying lays the shrimp completely flat. Both halves touch the grill at once. You get char on the cut side, a quick flip, and you're done. The increased surface area also means marinades and seasonings coat more of the shrimp, so every bite tastes better.

What size shrimp to buy#

Shrimp are sold by count per pound. The smaller the number, the bigger the shrimp. Here's what the labels mean:

For grilling, stick with 16/20 or 21/25. Anything smaller cooks too fast to butterfly and char properly. Anything bigger (U/10) is overkill unless you're showing off.

Buy them shell-on if you can. The shell protects the shrimp from drying out and adds flavor. You can grill butterflied shrimp shell-on or peel them first — both work, but shell-on gives you a little more insurance against overcooking.

How to butterfly shrimp step by step#

You need a sharp paring knife or chef's knife and a cutting board. Butterflying works whether the shrimp are peeled or shell-on. If you're leaving the shell on, leave the tail attached — it gives you something to hold while eating.

1. Devein first if needed. If the dark vein along the back is visible and thick, remove it. It's not harmful, but the texture is gritty. Use the tip of your knife or a deveining tool to pull it out. If you're butterflying, the vein will come out naturally during the cut.

2. Place the shrimp on the board with the back (curved side) facing up. The legs should be down, the natural curve arcing upward.

3. Make a shallow cut along the back from head to tail. Start just behind where the head was (if it's been removed) and cut along the top curve. You want to go deep enough to split the shrimp almost in half, but not all the way through. Stop about three-quarters of the way through the thickness. If you cut all the way, you'll have two separate pieces instead of a butterfly.

4. Open the shrimp like a book. Press gently on both sides to flatten it. The two halves should stay connected along the bottom edge, forming a symmetrical shape like butterfly wings.

5. Remove the vein if you didn't already. It should be exposed now. Just pull it out with your fingers or the knife tip.

6. Repeat for the rest. Once you've done a few, you can butterfly a pound of shrimp in under five minutes.

How to grill butterflied shrimp#

Butterflied shrimp cook fast. The thinner profile and increased surface area mean you're working with a 1.5 to 2 minute per side window for jumbo (16/20) shrimp. Smaller shrimp cook even faster.

1. Preheat the grill to medium-high (around 400–450°F). Clean and oil the grates so the shrimp don't stick.

2. Season or marinate the shrimp. Keep it simple: olive oil, salt, pepper, garlic, and lemon. Or go with a marinade — just don't marinate longer than 30 minutes or the acid will start to cook the shrimp (the texture gets mushy). Pat the shrimp dry before grilling so you get a good sear instead of steam.

3. Place the shrimp cut-side down on the grill. The butterflied, opened side should touch the grates first. This gives you the best char and caramelization on the most visible part of the shrimp.

4. Grill for 1.5 to 2 minutes without moving them. You're looking for grill marks and the edges turning pink and opaque.

5. Flip and cook for another 1 to 1.5 minutes. The second side cooks faster because the shrimp is already hot. Watch for the color to turn fully pink-white and opaque. The shrimp should feel firm but still have a little give when you press it.

6. Pull them off immediately. Carryover cooking will finish the job. If you wait until they look "done" on the grill, they'll be overcooked by the time you eat them.

How to know when shrimp are done#

The safest way is a thermometer. Pull the shrimp when the thickest part hits 135 to 140°F. At that temp, the shrimp are just turning opaque and still juicy. The USDA recommends 145°F, but that's the edge of overcooked for most people. If you pull them at 135–140°F, carryover heat will bring them to 145°F off the grill.

If you don't have a thermometer, use these visual cues:

• Color: The shrimp should be pink-white and opaque all the way through. Any translucency means they need more time.
• Shape: Perfectly cooked shrimp form a loose C-shape. Tight, tightly curled O-shapes mean they're overcooked.
• Texture: Press gently with tongs. It should feel firm but springy, not hard or mushy.

Shrimp go from undercooked to overcooked in less than 30 seconds. When in doubt, pull them early. You can always throw them back on for 10 more seconds. You can't un-overcook them.

Common mistakes and how to avoid them#

Cutting all the way through. You want a hinge, not two separate pieces. Practice on one or two shrimp first until you get the feel for the right depth.

Marinating too long. Acid (lemon, lime, vinegar) breaks down shrimp protein quickly. Fifteen to thirty minutes is plenty. Longer than that and the texture turns mushy before you even hit the grill.

Using medium or small shrimp. Anything smaller than 21/25 is hard to butterfly cleanly and cooks in under 2 minutes total. You won't have time to get good char without overcooking the inside.

Not preheating the grill. Shrimp need high heat to sear quickly. If the grill isn't hot enough, they steam instead of char, and the texture goes rubbery.

Walking away. Shrimp cook fast. Stay at the grill. Check them every 30 seconds. Set a timer if you need to.

Skipping the oil. Even on a clean, oiled grill, butterflied shrimp have a lot of surface area that can stick. Toss them in a little oil before they go on.

What to serve with grilled shrimp#

Butterflied grilled shrimp work in almost anything. Toss them into a salad, pile them on tacos, serve them over rice with a squeeze of lime, or just eat them straight off the grill with cocktail sauce or aioli.

They also reheat better than non-butterflied shrimp because the flat shape lets them warm evenly without drying out. Store leftovers in the fridge for up to two days and reheat gently in a skillet with a little butter or oil.

Frequently asked questions#