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Buttermilk is pretty expensive to use as a brine and "throw away" after no??? I love the picture of it hanging over your sink faucet. My wife would flip. HAHA. On the ribs, why were they amazing? Did the buttermilk help the flavor or jus the tenderness? ( I think you only replied on brisket for that question.
The ribs were really tender and did not notice any buttermilk flavor..... As for buttermilk being $$$, a local store sells it for $2ish for a 1/2 gal. I bought around 3 1/2 gals to do both the ribs and brisket..... I have done worst in my kitchen that my wife has saw. Cleaned snapper, redfish, snipe, cut deer meat. Just about anything lol....
Ok I've buttermilk with brisket and pork shoulder or butt. It works wonders. I take it a step farther and my blend of spices and liquids apple juice &/or chicken stock with the buttermilk. Tenderize and getting flavor into the meat. For competitions, I add kosher salt and inject the meat before brining. To speed up the process.
I've never done just buttermilk in bbq. That don't mean it can't be done. I've added spices I like, with apple juice and or cider. I've let soak 1 day and I've let soak 5 days. The 5 days only because I was so busy from during the week after I started soaking the brisket. However with the other stuff I had in with the buttermilk. It was like magic.