Anyone else tried this with fresh pink grapefruit instead of lemon?

I first made this with Campari and it was too bitter. Adjusted the specs - 25, 25, 20, 22.5 - and I couldn't get enough... But that still didn't get the Cascahuin to pop. So these specs - 30, 25, 15, 15 - did, but I'm not sure which I liked more... Despite the straying from the even-measure recipe, the drink still pretty much tasted like itself.

Lemon seemed to overpower the subtle notes of the Amaro and the tequila was completely lost. I'd suggest cutting lemon juice in half. It was a much better the second round, better showcase of the other 3 IMO.

Lazy bum that I am, I used the juice of 1/2 a lemon without measuring. Mea culpa. But it was still really good.
This was a great way to use up the Amaro Meletti I accidentally bought. Now that it's gone, Amaro Nonino slides in just fine, thank you very much.

made with santoni... i like the bitter but its too sour

Good paper plane riff, adding this to my collection

I replaced Meletti with Amaro Nonino which possibly produces a softer version. The better replacement would have been Ramazotti, because both use cola-nuts 🥺.

Made one using mezcal. Bitter, sour, sweet, and smokey in perfect synchronized harmony.