Cook spareribs, in the oven, for a total of six hours at 225° F. For the first (1) hour cook the ribs in the oven as I have outlined here, but without the sauce. Then wrap the ribs infoil and cook them two (2) hours. For the final phase, remove the foil and cook them for three (3) more hours. Cover with sauce during the last two hours of cooking.

If you want to use this method on baby back ribs, make the time intervals 45 minutes instead of one hour: so (1) - 45 minutes without sauce or foil; (2) - 90 minutes wrapped in foil; (3) - 2 hours 15 minutes unwrapped. Cover with sauce last 90 minutes

The trick to great ribs is to cook them very slowly with the BBQ sauce on them. You can do this in an oven, just set the temperature to 225° F (about 107° C). I occasionally use an electric smoker, which cooks at about 200 to 225 degrees Fahrenheit. I've also used this method on my gas grill and in my oven. Cook the ribs for 4½ to 5 hours. The time it takes you to cook the ribs may vary depending on the true temperature of your grill, oven, or smoker, the temperature of the ribs when you start, and other factors. Baby back ribs take 30 to 45 minutes less than spareribs. Try a half rack the day before you intend to use this method the first time, so you can get the timing correct.
I don't actually smoke the ribs; I don't put any wood chips in the smoker, although that might be good if I weren't using any barbecue sauce. I do have a pan of water below the meat in the smoker though, just as if I were smoking them. Don't use a pan of water if you're cooking your ribs in the oven or on your grill. The pan of water isn't necessary, however you will need a pan or aluminum foil to catch any drippings and keep from making a mess of your oven.

Uncooked Spareribs with BBQ sauce on them.

Also, use a rack, so the ribs can be cooked standing up. This will save you room, and it separates the racks of ribs so that the sauce cooks on to the ribs. I generally cut the rack of ribs in half before cooking it, to make it easier to handle. There are a few rib racks available at Amazon. I'd recommend the Weber rack, as it is less expensive than others, but any of them will work. The rack I use came from Home Depot, and is a Char-Broil