[BDK] Fabulously Filthy: Cooking meals on filthy floor doesn't fulfill

I had this issue too and found my game wanted certain very specific things to be dirty. I had food out to spoil, the floor level said filthy, and still it wasn’t completing.

What finally did it for me multiple times with different sims/households now is telling rhem to empty an indoor trash can and then cancelling it so they drop it on the floor. 

Sometimes I had to do this a couple times but then when cooking it checked off that aspiration task. I haven’t tested it but I wonder if having dirty laundry piles on the floor would also work or not.