If you are after a little colour and froth, then the Purple Haze Sour is the fruity Whiskey Sour riff you’ve been looking for. This cocktail mixes Bain’s Single Grain Whiskey, Sweet Vermouth, Blueberry Puree, Apple Juice, a blend of Lemon & Lime citrus, Sweet Vermouth, Vanilla Syrup, Bitters, and Aquafaba for that bit of foam.