I like to put a rasher or 2 of chopped up bacon in with any meat that's going in the slow cooker. It infuses the whole thing with a wonderful smoky aroma!
I like Osso Bucco beef shin crosscuts (the one with the huge marrow bone in the middle:)
Chuck a few of those in with a chopped up onion and 2 chopped up rashers of bacon. Sprinkle with paprika, salt, pepper. Leave on low for about 9 hours, done!