We enjoyed this but found it a bit thin. We have some ripe lemons on our tree so we might try commentor Heidi's suggestion for lemon syrup. In the meantime, an added 5ml Cointreau filled it out quite nicely for us. This is one we will enjoy experimenting with.
btw not having ginseng bitters, our work-around was four drops grapefruit bitters, two drops lavender bitters, one drop barrel aged bitters and one drop celery bitters. Purely speculative.
This is bright and tart. It'll make you blink a little, but it's very engaging, especially if you're a lemon lover, I happened to have a little lemon syrup on hand, so I add a light 1/2 oz and gave it a whiz with the frother. It brings the cocktail into delish dessert territory. Makes it a different drink, for sure, both very enjoyable.