Slow Cooker French Dip - add 1c water & 1 packet au jus to slow cooker & whisk. Season 2-4lb. bottom round roast or sirloin tip roast with salt, pepper & onion powder. Brown roast in 1T oil, then add to slow cooker. Cook on low 8-10 hours. Make another au jus packet per directions. Shred meat, discard fat. Melt cheese on bread in broiler. Add sautéed mushrooms & onions.