McCormicks slower cooker Savory Pot Roast season packet An Au Jus packet A Can of Pepsi or coke(im going to try diet) And Boneless Cross Rib Roast Put your Roast in the crock pot. Mix the Slow cooker seasoning with 1 cup of Water. Pour on top of roast. Add the whole can of Coke. Cover with your lid for 8 Low or 4 hours on high. Its VERY important that you never lift the lid!