This maybe isn't quite what you're looking for, but I freeze a lot of meat in whatever marinade I've mixed up. I then either dump it frozen into the slow cooker in some cases, or just thaw it in the fridge and quickly grill it for dinner. If you're careful not to use sugary marinades -- I usually make my own so I can control the ingredients -- all you need are some non-starchy veggies on the side for a low carb meal.