1. Prepare your garnish first by soaking rose petals in grenadine.
2. Allow those to soak until the petals abord some of the color.

For the Cocktail

1. Add ice to a cocktail shaker then add vodka, Cointreau, white grape, and lemon. Shake until frost forms on the outside of the shaker.
2. Double strain pour into a chilled Coupe glass.
3. Garnish with a petal by dripping the grenadine into the drink and dropping in the petal. The grenadine will fall to the bottom of the glass. This mimics a drop of blood.