Whiskey Sour
Bourbon, lemon and simple syrup in the classic sour proportions — 2 to ¾ to ½. Add an egg white and it becomes a thick, foam-topped drink served up; leave it out and it is a sharp one over ice. Both are correct.
At a glance
Ingredients and method are in the app
Kitchen Pantri holds the full ingredient list and step-by-step method for Whiskey Sour, checks it against what is already in your pantry, and adds anything missing to your shopping list. The app is free to use; you set up a Pantri account when you first open it.