This is a unique and delicious cocktail that combines the rich, smoky flavor of bourbon with the bittersweet taste of Aperol, and the subtle herbal notes of fresh rosemary. Here's what you'll need to make it:

Ingredients:
- 2 oz bourbon
- 1 oz Aperol
- 1/2 oz fresh lemon juice
- 1/2 oz rosemary simple syrup (made by combining equal parts sugar and water, and adding a few sprigs of fresh rosemary)
- Fresh rosemary sprig for garnish

Instructions:

1. In a shaker, combine the bourbon, Aperol, lemon juice, and rosemary simple syrup.
2. Add ice and shake well until chilled.
3. Strain into a chilled glass filled with ice.
4. Garnish with a fresh rosemary sprig.

Enjoy this unique and delicious cocktail with friends or on your own. It's perfect for any occasion and will definitely impress your guests with your mixology skills!