45ml (1.5oz) gin
22.5ml (0.75oz) lemon juice
22.5ml (0.75oz) simple syrup
1/2 teaspoon Grenadine
White of 1/2 small egg
Add ingredients to a cocktail shaker - without ice - and shake well to lightly whip the egg white. Add ice and shake some more, before straining into a martini or champagne coupe glass.
It's not even that hard to make, once you've dealt with the egg white (which, by the way, definitely benefits from a bit of dry shaking before the addition of ice). Careful you don't overdo the Grenadine, that pink pomegranate syrup, which is better in touches.
MORE: For a Clover Leaf, simply garnish the thing with a sprig of fresh mint.