1) For pumpkin syrup, just mix all the ingredients in a small saucepan and bring to simmer. Simmer for about 5 minutes and then chill and use. It will store in the fridge fine for a week.
2) For pumpkin martini, wet rim and run it around some cinnamon sugar. Then shake ingredients together with ice and strain into chilled glass.
3) For vampire blood, combine ingredients in small saucepan and bring to a simmer. Reduce the mixture down by about 1/3 which should take about 20 minutes. Chill and use or store for up to 2 weeks.
4) For cocktail, mix gin and club soda over ice. Pour over vampire blood mixture and garnish with lime.