I added a Luxardo cherry and feel like 5ml of Luxardo cherry syrup (in addition to the maraschino liqueur) in place of the sugar syrup would add body and an interesting hue to the drink. Overall, a nicely balanced drink. As also said in Casablanca, “I think this could be the beginning of a beautiful friendship.”

It also seems safe to assume that one should muddle the limes at the end of step 3, then add the blackberries and muddle again…?

I added a splash of Cointreau before I saw the comment about using orange bitters. Cointreau did add something interesting though.

I used Damson plum jam bought from a local orchard. I agree that it was a bit more bitter than I like, but think it was more about balancing the lemon juice and simple syrup. The jam with apple brandy is fantastic.