I know this is the raw paleo forum, but I was thawing some suet ( about 1.5 pounds in the fridge in a zip lock bag) to cook it along with some steaks, and I accidentally left it maybe two or three days (obviously too long) in the fridge.  I just took it out and it has a moldy smell and I can see where the mold is.  I know some folks eat moldy meat, but I am not interested in experimenting with that.  My question is this: should I cut off the moldy parts and cook the rest or should I throw it out?  If I'm not completely successful in cutting off all the mold and some still remains on the suet, will cooking it take care of the mold (kill/destroy it) making it safe to eat

thanks for your help

also, how do I avoid this in the future?  Thaw it in the fridge for 12 hours( instead of leaving it for 2-3days)?  Or don't thaw at all?  Or don't thaw it in a closed ziplock bag and use some other method instead?