Windowsill

2 oz Bourbon Whiskey
1 oz YCC Key Lime Sour Mixer
0.5 oz lime juice
1 Egg white (or aquafaba)
Bangin’ Bitters: Aromatic Bitters

Combine all the ingredients in a shaker filled with ice and shake until chilled. Strain into a chilled rocks glass over one large cube of ice.
Top with 3 dashes Aromatic Bitters