I ran out of Aperol, and because substituting Campari makes it quite tart I added a dash of Benedictine. Wow, that made it better than the original. It brings in the sweetness while also adding even more herbal intrigue than the Nonino alone.
Punt e mes is great, but if you're like me and don't like to keep multiple open bottles of vermouth in the fridge, you can get something very close by adding quina liquor or frankly any bitter amaro to your regular sweet vermouth of choice.
That's a somewhat strange way to make a cocktail out of a very basic drink. The traditional way to make a Radler in Germany is to simply use half Pilsner and half Sprite. No ice needed and serve in a pint glass.