Are you of legal drinking age?
1/4 oz grenadine syrup
1/4 oz simple syrup
1 drop of peppermint oil (make sure it's only one drop; peppermint oil is strong)
Add all ingredients to a shaker with ice.
Shake and strain into a martini glass with a crushed candy cane rim.
Place candy canes in a strong sealable bag and break them into small pieces.