marmalade is a jam ... so I'd spread my toast with margarine which would melt and then add marmalade .... or you could just do the marmalade... I prefer both
I have on occasion also added peanut butter and made a sandwich. Usually peanut butter and jam sandwiches are made with sweeter jams but the tang of marmalade is a nice change.
I think I have a pretty good idea of what you are talking about now. I just don't know it as marmalade 😀