What I use are the following ingredients...
Balsamic Viniger
Red Wine
Olive Oil
Garlic (fresh or powdered)
Barbeque Sauce
Steak Spice
Paprika
Tai Spice
Finely Ground Black Pepper
Salt
I mix all the ingredients in a mug then pour over the legs in the slowcooker. Cook on low for 5-6 hrs basting the legs a handful of times with the juices while they cook. Serve on rice or roasted potatoes and veg.
You'll love it, I promise.