Season with salt and pepper.
Mix onion and bacon, spread over each steak.
Roll steaks (as you'd do for a jelly roll), tie rolls tightly in several places with a string.
Put steaks into slow cooker and add water.
Cover pot and cook on low for 8 hours.
If you want to serve this with gravy, remove meat when done, and thicken liquid with a mixture of flour and water and cook it in pot set at high for 15 minutes.