The loin primal is divided into two sections.  The forward part, from the thoracic section of the spine, contains ribs, and is usually trimmed to make rack of lamb.  The back part, from the lumbar section, contains no ribs, and is usually broken into lamb chops.

Dividing the Loin Primal into the Rib and Loin Subprimals

This is the whole loin primal, with the fell still attached.

Here is the underside of the loin primal.  You can see the rib section on the left, and the loin subprimal on the right.

We divide the two by cutting after the last rib bone, then cleaving through the backbone.

How to make a Frenched Rack of Lamb

Frenched lamb rack … Continue reading.