An accordion cut is a technique in butchery, similar to butterflying, in which a thick piece of meat is extended into a thin one with a larger surface area. A series of parallel cuts are made from alternating sides of a roast almost all the way through, creating "hinges" which allow the meat to unfold into a long, flat, piece.
This technique is often used in conjunction with pounding with a meat mallet, to further thin and even out the cut.
A similar technique is also seen in accordion potatoes (also known as Hasselback potatoes) where the potatoes are sliced across the surface to create a larger surface area.
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