Maple Sour with Egg White Foam

Foamy egg whites on top of this cocktail plus a splash of maple syrup add texture and a surprising twist to the classic sour recipe.

Whiskey sours made with store-bought mix were my drink of choice for a while in college. Then I became an adult and graduated to the homemade version, which is SOOOO much better. 

I go traditional and dry-shake an egg white for the top of the cocktail - technically making it a Boston sour in a nod to my home state. 

"Egg whites in cocktails?", you might say. "Oh yes,"...