Kumquat Sour is tasteful quite strong cocktail at 1.4 standard drinks. Shaken with 45ml cachaca and 20ml kumquat juice with 10ml kumquat syrup as well as 15ml egg white including 100ml ice and served for or with tiffins. Just add all ingredients to shaker then dry shake and add ice to shaker. Shake well until foaming and strain into glass and garnish with kumquat peel and served in a saucer glass cold.