My son will eat any kind of pot roast (chuck roast / beef short ribs) cooked in the slow cooker-- as PPs said, you cook low-and-slow with a sauce. I layer veggies on the bottom (often carrots and mushrooms), then the meat, season it with salt and pepper, then the "sauce." Sometimes crushed tomatoes with seasoning, sometimes a can of condensed cream of celery or cream of mushroom. Cook 8 hours on low. This is easily separate-able.

Then I make a starch on the side.
Meatballs also work well in slow cooker. Prepare as you normally would (ground meat of some sort, breadcrumbs, egg, seasoning), bake on cookie sheet for 45 minutes (or until done), refrigerate until next day. First thing in the morning put in slow cooker with tomato sauce (I make my own using crushed tomatoes, tomato paste, seasoning, etc.) Cook all day on low.