I always use extra virgin oil,both for fry both for seasoning and also to do some biscuits. In Italy we produce and use a lot of EVO, particularly in the South. In the north (Milano,where I live), used also the butter to fry for some traditional recipes as the cutlet or to mix risotti. In the South of Italy is very rare to use butter.Maybe they only used it on the slices bread with jam for breakfast ( but I don't bet!). I use and love also peanuts oil.