I made this drink according to this recipe (even duplicating the garnish), and it's a nice rum punch. The fernet is totally in the background and doesn't overwhelm the drink, so this might be good for someone who is fernet shy. I've made a note to amp the fernet up to 7.5 ml and the apple cider vinegar up to 3.75 ml the next time I make it, but I can't guarantee that will be an improvement.