This rich ragu-like dish is much simpler than the traditional French salmi, which involves a gruesome tool called a duck press (used to extract the juices from the carcass for enriching the sauce). Other game birds can be substituted. If you aren’t saving the backbones for stock, they can be added to the pot with the squab to enrich the sauce, then removed before serving.
Remove the backbone and split in half at the breastbone:
Season on both sides with:
Heat in a large skillet over medium-high heat:
Working in batches, add the squab skin side down and cook until browned, about 5 minutes. Turn over and cook for 2 to 3 minutes more. Transfer to a plate. Add to the skillet and cook, stirring, until they begin to brown, about 8 minutes:
Reduce the heat to medium and cook, stirring, until the mushrooms are softened, about 5 minutes. Add and cook, stirring to loosen the browned bits, until almost evaporated:
Add and cook until reduced by half:
Return the squab to the skillet and simmer gently, covered, until the meat begins to fall from the bone, 20 to 25 minutes, turning the birds halfway through cooking. Remove the skillet from the heat and transfer the birds to a plate to cool slightly. Pull off and discard the skin of the birds, then pull the meat from the bones and add it to the skillet. Stir in:
Serve over: