Fill a mug or tall glass with ice. Add the vodka, spiced pear simple syrup, and lime juice. Top with ginger beer. Stir, and garnish with a pear slice and cinnamon stick.
To Make The Simple Syrup
Add 1 cup of pear juice, 1 cup of sugar, 2 cinnamon sticks, and 3 whole cloves to a small saucepan. Over medium-high heat, bring the mixture up to a simmer, stirring until the sugar is melted. Turn down the heat and let the syrup simmer for 15 minutes. Remove from heat.
Once the mixture is cooled, strain the simple sugar and store it in a jar with a lid. Chill it in the fridge until you're ready to make your Spiced Pear Moscow Mule.