Go easy on the aromatic bitters (use drops rather than dashes) or your Casablanca will be more orange than "blanca". Original recipes in The New American...
This was really good! I had it in honor of my bazzionth viewing of Casablanca the other day. I added some sour cherries from Greece, with a dollop of the syrup, and it went really well. I haven't had a White Lady in ages, but I'll have to compare. I'm not sure I'd skip the Maraschino, because I love it.