Melt some butter in a saucepan and leave it for a few minutes so it isn’t scorchingly hot, then
carefully dip coat your duffin and roll it in sugar until coated.
It was the sugar coating that completely transformed them for me. One bite was enough to transport me back to sunny days eating warm doughnuts from a paper bag at the seaside. Something about that sugar totally tricked my tongue into thinking that they were actual doughnuts. Yum!