I need a mod to stop sims doing this

It works beautifully for me and there's also a "Don't cook food where you angry poop" which I think Basemental has also taken over. That allows you to enable or disable counters for food prep. For example in one house of mine they were going from the kitchen all the way down to the far side of a huge basement to chop salads on a lab counter - with the mod you just disable the ones you don't want them to use (or enable the ones you do want them to use, I forget which way it goes. It's just a matter of clicking on the counter or sink, though.)