Treacle fudge is a kind of fudge. Rubeus Hagrid usually made this, and according to him, "gets rid o' slugs in a jiffy". Treacle fudge could be bought at Honeydukes Sweetshop, in Hogsmeade. This was used on Ron after his slug-vomiting-spell backfired on him, after he tried to curse Draco Malfoy after calling Hermione a "Mudblood"