When I have had the South African version of a Dutch Oven stew the cast iron pots start off red with rust as they live outdors,- a little heat, a little oil and a little rub down with a sourer and they were ready for cooking!
My own cast iron goes home with me after each tip, gets a wash to remove any surface crud is dried on top of the rayburn then oiled and stored for the next trip.
I did for a while use a double sided griddle but carfuly cleaned it between flipping it ove.
These days I use a good Welsh bakestone!
All the ridged side of a double sider does is burn a pattern onto your steak....