If you want to add a bloody rim, you can use a thickened homemade blood orange syrup. Simply pour a small pool of syrup on a plate and twist the rim of the glass in the syrup. When you flip the glass right-side-up, let the syrup drip down the sides like blood.
Add all ingredients, except the Champagne, to a cocktail shaker with ice and shake
Strain into a coupe or champagne flute with a bloody rim and top with 3 oz of chilled champagne.