I tried to by real Seville marmalade in Seville. 15 minutes after asking for marmalade de naranjas I learned that marmalade means any sort of jam in Spanish and that what we call Seville oranges are not called naranjas and that the toast spread made from them has a nother name not at all related to marmalade.
But eventually I got my Mom's souvenir. (I don't even like the stuff)