My wife recently bought a cast-iron waffle maker. We've tried it a few times with no success. The batter recipe that came with the waffle maker comes out like glue and burns on the outside and is still uncooked in the middle. We have a propane range and we've tried using a stovetop heat diffuser. The waffle maker we've seasoned with crisco. If anyone has any tips/suggestions/ waffle batter recipes I'd appreciate it, thanks.