Choose your gin carefully. Most gins with British roots are better than standard commercial U.S. gin. This recipe works great with Bombay Sapphire. First key step: use a good French dry vermouth a brand like Noilly Pratt, for example. Third, do not compromise on the blood orange bitters. Add the liquid ingredients to a shaker filled with shaved or cubed ice. Shake until the liquid is quite cold. Place two olives in a martini glass. Pour cold shaken liquid over the olives.