You never feel more like an old-school Hollywood actor than when you're drinking a Manhattan. I hemmed and hawed about changing the name of this drink, but I decided it's too classic. You need to know what you're getting.
What you're getting is all the classic balance of the alcohol punch against a bit of sweetness. You're also gaining the lighter and hazier appearance of the limoncello, making for a distinctive twist on the standard Manhattan.
Because the Manhattan is one of my favorite drinks, I'm picky about the ingredients. I like Bulleit bourbon, though I don't think that matters a great deal. What DOES matter is the sweet vermouth, it has to be Antica Formula--nothing else will do.
The cherry also matters. It can't be one of those overly al dente, radioactive red maraschinos that you get on top of a sundae. As usual, I recommend going full Italian and only accepting a Luxardo cherry. Add some high-quality limoncello and you get a Manhattan from Little Italy (the name I had to mightily resist giving the drink...)
Combine all ingredients (except lemon peel) in a shaker with ice and shake to combine
Serve straight up with lemon peel, garnish with a Luxardo cherry