1-First Step: Mix the blood rimIn a microwave-safe bowl, combine the corn syrup and red food coloring. Stir well until the color looks even and the syrup turns a vivid red. This mixture creates the signature rim, so take a moment to blend it smoothly.

2-Second Step: Warm the rim mixtureMicrowave the bowl for 45 seconds to 1 minute, just until the mixture starts bubbling. Keep a close eye on it. You want it warm and fluid, not overcooked. Overheating can make it harden too much once it cools.

3-Third Step: Cool it properlySet the bowl aside and let the mixture cool to room temperature. This step matters because a hot rim mixture can slide off the glass and get messy. A cooled syrup gives you better control when dipping the glass.

4-Fourth Step: Rim the cocktail glassLightly dip the rim of a cocktail glass into the cooled mixture. You do not need a heavy coat. A thin, even layer looks dramatic and lets the drink stay neat when you sip it. If you want a more subtle effect, reduce the amount of maraschino cherry liquid in the glass later or keep the rim light and glossy.

5-Fifth Step: Chill the cocktailFill a cocktail shaker with ice, then add the whiskey, sweet vermouth, and bitters. Stir the mixture until it is well chilled. Since this is a stirred cocktail, you do not need to shake it hard. A smooth stir keeps the drink clear and balanced.

6-Final Step: Strain and garnishStrain the chilled cocktail into the rimmed glass. Top it with a maraschino cherry for garnish, and serve right away. The red rim against the deep amber drink gives The Bloody Manhattan its Halloween cocktail vibe with almost no extra effort.