Chocolate. I used to dip my fries in it too lol.
Unrelated somewhat, but I live within 3 miles of where the original Wendy's restaurant was. It was right in the middle of downtown, but due to its placement and how old the building was, it wasn't getting enough traffic, even in the middle of a busy street like that. So it got torn down.
The Wendy's headquarters, as I understand it, is in Dublin, OH, some 15 miles from here. It's near the Columbus Zoo.