Came across this one when perusing 901 Very Good Cocktails yet again one evening. It felt like exactly the drink I was in the mood for and since I like big words, I couldn't resist.
If you never saw the 901 VGC list here on BarNotes, check out his book at:
2 oz. Gin
1 oz. Aperol
1 oz. Fresh lemon juice
.5 oz. Maraschino liqueur
Orange peel for garnish
Pour ingredients into a shaking tin, add ice (large cubes if possible) and shake vigorously!
Strain over fresh ice and garnish with orange peel.