Prepare the glass rimmer by mixing corn syrup and food coloring in a medium shallow bowl.
When glass is chilled, carefully dip the rim in the bowl with the “blood”. Be sure to place a tray or paper towel under the glass to catch any drips. Return the glass to the refrigerator to set while preparing the cocktail.
Fill a cocktail shaker with ice.
Add the vodka, cranberry juice, and Chambord to the cocktail shaker.
Shake. Pour into the prepared Martini glass and enjoy.