Butterflying a Chicken Breast

What It Is

Butterflying opens a thick chicken breast into a flatter, even "steak" by cutting horizontally through the thick side almost to the far edge and folding it open like a book. The two halves stay hinged along one side.

It is not about making the meat thin. It is about making it uniform, so every part of the breast reaches doneness at the same time.

Why It Matters

A whole breast is a wedge. Fat at one end, tapering to thin at the other. Cook it whole and by the time the thick middle is done, the thin tail is chalk. Butterflying removes the wedge.

Lean meat has no margin. Breast meat turns dry once it pushes much past ~65°C, because the muscle fibres contract and squeeze out their water. With no fat to hide behind, you cannot afford part of the piece overshooting while another part catches up. Even thickness means the whole breast hits the target together, which is the single biggest lever on juiciness.

It gives a topping somewhere to sit. A flat, even surface holds a paste or a cheese layer in place and lets it gratinate evenly, instead of sliding off a domed breast.

How to Execute

Dry and steady. Pat the breast dry; a wet surface slips under the knife. Lay it smooth-side up with the thickest side towards your knife hand.

Flat hand on top. Rest your other hand flat on the breast to stop it lifting, fingers up and out of the blade's path.

Knife parallel to the board. Starting at the thick edge, cut horizontally into the middle of the breast, keeping the blade level. Long, smooth strokes; do not saw.

Stop short. Cut to within about 1 cm of the opposite edge so the halves stay hinged.

Open like a book. Fold the top flap back. You should have a heart-shaped piece of roughly even 1.5 cm thickness.

Level, don't pound. If one side is still thicker, a couple of light taps with the flat of your hand, or a few gentle strokes under cling film, will even it. You are levelling it, not flattening it into an escalope.

Common Mistakes

Cutting all the way through. You now have two thin cutlets. Fine if that is what you wanted, but they cook faster and dry sooner.

Tilting the blade. An angled cut gives you a wedge again, one half thick and one thin. Keep the blade dead level with the board.

Working on a wet breast. It slides and the cut wanders. Dry it first.

Pounding to fix a bad cut. Aggressive pounding tears the fibres and makes the meat spongy. A level cut needs almost no correction.

How to Tell When You've Nailed It

Look. Opened flat, the breast is an even sheet: no thick hump in the centre, no paper-thin tail.

Feel. Press across the surface and the give is the same everywhere, with no dense lump.

In the pan and oven. It colours evenly when seared, and a probe reads the same in the centre as two-thirds of the way out.

Make-Ahead

Breasts can be butterflied the day before, laid flat in a single layer and kept covered in the fridge. Take them out 20 minutes before cooking; cold meat cooks unevenly.