This variation on the Aperol Sour by created by Bobby Heugel of Anvil in 2010. I got it out The Art of the Shim while trying to find a use for some leftover lime juice. While I was a little skeptical of the recipe, I decided to go for it anyway.
2 oz Aperol
0.75 oz lime juice
0.75 oz elderflower liqueur
Combine all ingredients, shake with ice, then strain into a chilled glass and optionally garnish with a spring of rosemary.
The aromas are driven by the St. Germain with a bit of extra fruit from the Aperol. The flavors begin with big, round sweetness balanced by lime up front, adult Tropical Fruit Punch in the middle, then surprisingly bitter going into the back. The finish has a pleasant lingering bitterness, some roundness from the St. Germain, and lime peel.
This is just so, so nice. As with the Reverse Perfect Man o' War it looked too sweet from the recipe, but never strayed too far in that direction. It was also surprisingly complex for being all of three ingredients with the two liqueurs showing off their best sides while being kept in check by the lime juice. While a solid aperitif as written, I can also imagine this being great built over ice, especially when it's warm.