Place the ribs into the bottom of a well greased crock pot. Lay the onions over the top of the ribs.
Whisk together the barbecue sauce and lemon juice until blended well. Pour the mixture over the ribs.
Place the lid on the crock pot and cook on low for 8-9 hours or until the ribs are cooked through and tender. Be sure to baste the ribs every once in while keep them coated on both sides.
Notes
Although removing the lid of the crock usually means an extended cooking time, this recipe calls for it. Making sure you baste the ribs occasionally will keep them from becoming to dry on the bottom and running your meal. It will not extend the above cooking time.