As the title says, I think it would be a cool idea to add different types of pans, all use the same recipe and casting as the current Pan, but if you use copper you make a copper pan, if you use steel you make a steel pan, etc.
What each pan can do would be something like focusing an FEP. It wouldnt add or remove FEPs, but it would put more of a weight to 1 FEP.
Say you are cooking with a copper pan, and my idea for copper is have a Perception focus, so if you have a dish that gives 3 perc, 3 str, and 3 int, it would change to 5 perc, 2 str, 2 int, and each pan can focus a different FEP
These are just some personal ideas and are subject to change if the idea seems good enough:
Copper > Perception
Tin > Will
Lead > Charisma
Bronze > Constitution
Cast Iron > Dexterity
Wrought Iron > Agility
Steel > Strength
Silver > Intellect
Gold > Psyche
You can even add a "mixed" metal frying pan that is what the current frying pan is with no focus, just use different metals in the cast when making it.