No, this isn’t a cast iron thing. Using stainless pans, you can get nonstick effects that, in my experience, far outperform Teflon anyway. The process is called “spot seasoning.” I have cooked crispy, cheesy rice noodles with eggs with zero sticking.
I love my cast iron pans, but stainless is my daily go-to. Added bonus: use 100% copper wool to clean your stainless pan. The copper-coated wool at most grocery stores is problematic; you might get a few uses out of the coated garbage and then it starts shedding metal bits.
Knife hipsters: You must spend £200 on these whetstones!
Me: Haha, £1.50 roof tile.
Shame I don’t live near anywhere to get slate or another suitable rock type, would be a few hundred miles away. The rock here is rather crumbly sedimentary rock from what I have seen. Slate coasters could be dual purpose.