1Pour 3 cups from the apple cider jug and set aside for another use.
2Add tequila, triple sec, lime juice, and 3 tablespoons maple syrup to the remaining cider in the jug. Add the cinnamon stick and seal the cap.
3Tilt the jug to combine ingredients and refrigerate until very chilled.
4In a small shallow dish, mix the sugar, cinnamon, and kosher salt together. Pour a little maple syrup into a second shallow dish.
5Dip the rim of the serving glass in maple syrup and then in the cinnamon sugar mixture. Fill the glass with ice.
6Add the desired amount of the margarita mixture to a shaker with a few ice cubes, shake well until lightly frothy, and pour over the ice in the prepared glass.
7Serve with an apple slice and cinnamon stick garnish if desired.