In a mixing glass 2/3 filled with ice, combine Kerrygold Irish Cream, vodka, allspice dram, and raspberry syrup. Stir 20 seconds to chill and strain over fresh ice in a rocks glass. Garnish with raspberries and a dusting of cinnamon for garnish.
In a medium saucepan over medium-high heat, combine sugar and water. Stir to dissolve and add raspberries. Reduce heat to low and simmer 10 minutes, remove from heat and let sit 30 minutes. Strain into an airtight container. Store in refrigerator up to 2 weeks.