Combine ingredients for BBQ rub in a bowl and mix well. Set aside.
Rinse ribs and remove membrane on the bone side of the ribs
Rub ribs with mustard and apply a generous, even coat of the BBQ rub on both sides.
Cover your ribs and put them in the refrigerator for one hour.
Set-up your grill or smoker for indirect heat at a temperature of 225°F - 240°F (I recommend using a digital oven/grill thermometer for an accurate temperature reading).
Once your grill/smoker has reached that temperature, place one or two chunk of wood directly on the coals. Put your ribs on the grill and close the top.
Add 2 wood chunks approximately every 30 to 45 minutes.
After 3 hours, wrap ribs in two layers of heavy-duty aluminum foil. Be careful not to puncture the foil with any pointy edges of bone or meat. If you like, you can put about ¼ cup of apple juice at the bottom of the foil. This, however, is optional.
You should now cook the ribs for another 2 hours at 225°F. If you can maintain this temperature on your grill/smoker, great. If not, put the ribs in the oven at this temperature.
After two hours, remove ribs from the foil and put them back on the grill for 45 minutes to an hour. If you want, you can sauce them in the last 15-20 minutes. Keep an eye on them because the sugar from the BBQ sauce burns easily. Slice and enjoy!
Recipe by Big Ken's BBQ at http://bigkensbbq.com/recipes/pork/ribs-pork/spare-ribs/bbq-spare-ribs/