Apple Dulce De Leche

First make the caramel-infused vodka. Boil water and place a can of condensed milk into it. Boil for three hours, adding water as necessary, until caramelised. Set aside half a bottle of vodka and add half of the can of caramel to the remaining vodka. Top the infused vodka with reserved pure vodka and store for three days in a fridge. After three days, strain the infused vodka into an empty bottle using a coffee filter.// To make the cocktail, combine all the ingredients into a mixing glass with ice and stir. Moisten the rim of a cocktail glass with sugar syrup then roll in cane sugar and cinnamon. Strain the mixture into the glass and garnish with an orange slice before serving.