Everytime I leave an opened jar of pasta sauce in the fridge for more than a couple weeks it gets a big chunk of mold on top. It has happened with various brands and with the jar stored in different locations in the fridge, on the door and on the shelf.
I either pour it from the jar into a cold pan so no steam gets in or use a clean spoon and always screw the lid back on tight. Does anyone else have this problem? What am I doing wrong? This doesn't happen with any other product in my fridge.