First, make the stuffing. Melt butter in a large sauté pan until sizzling, brown mushrooms and bacon together in butter, reduce heat, and add onions, thyme, and bay leaf. Cook together until onions are soft. Add chicken stock and bring to a simmer.
Remove from heat and combine with toasted cubes of focaccia. Stuffing mixture should be moist enough to stick together without the bread being completely saturated.
Season with salt and fresh cracked pepper. Allow stuffing to cool enough to handle.
Preheat oven to 325°F.
In the meantime, season roast inside and out generously with salt. When stuffing is cool, peel back rib cap and stuff with an even layer of bread mixture.
Cover stuffing with rib cap and place fat side down on your cutting board. Tie roast with butcher’s twine between each rib. Brown the fat side of roast in a large sauté pan until it is a rich brown colour.
Stand your roast ribs pointing straight up in an oven ready dish and bake uncovered until a meat thermometer registers 135°F, approximately 20 minutes per pound.
Remove roast from oven and allow to rest for 5 minutes per pound before slicing between the ribs.