A recipe from the great Dale DeGroff, in his book 'The Craft of the Cocktail', this is a variation on a whisky sour but without egg white - Dale (who can be trusted in all things cocktail) insists egg whites are wrong. I quite agree. This consists of (for 2 people): 4 parts blended Scotch ( a good brand, please, we use Grant's Family Reserve), 1.5 parts curacao (i.e. Cointreau), 1 part fresh lemon juice, 1/2 part gomme syrup, and 2.5 parts soda water. These should be stirred in a mixing glass over ice (not shaken) and strained into 2 chilled martini glasses. Serve with an orange twist. Very nice, and deceptively 'quaffable' because of the soda water. Beware, though, it packs a punch!