Since I got my egg, I have had great sucess with baby backs, not not nearly as good a result with spareribs. Always tated kinda fatty and just not as good as BB.
Anyway today I decided to try something different. Last night I rubbed two racks of spares with a combo of Stubbs Rub (I'm out of Dizzy Dust) Swamp Venom and some kosher salt. Coated the ribs with mustard and put them back into the fridge.
Today, I loaded up the egg and set the ribs on direct @ about 225-250. To start with I had the ribs in a rib rack, and turned them every 30 minutes. After the 3rd turn, it the rib rack was getting to be a hassle, so I flopped the racks flat on the grid one on top of the other. Every 30 minutes I rotated the ribs. After 5 hours, the racks had great bark, and the ends of the bones were exposed, but the bones failed the twist test. So I pulled the racks and put them in foil, and stuck them in a 300 degree oven for about 30 minutes. Bones now pass the twist test.
I'm telling you these are the best ribs I have ever made.