Cut apart your ribs, sprinkle with salt and pepper and brown briefly in a skillet.
Place ribs in lightly greased baking pan, top with sliced onions and pour in the beer.
Cover with foil and bake in 375 oven for 1 1/2 hours.
Remove ribs from the oven, remove the foil, and carefully pour off the beer. Leave the onions in the pan!
Pour the entire bottle of BBQ sauce over the ribs and return, uncovered, to the oven for an additional 1 hour.