Cream buttermilk, apple juice, honey and 1 teaspoon lime juice with a hand blender. Wash the apple, remove seeds. Cut off 4 small slices and put them on a wooden skewer. Cut remaining apple into large slices.
Sprinkle with 1 teaspoon lime juice. Pour the drink into a glass, dust with cinnamon. Decorate with straw, apple skewer and lemon balm. Add apple slices.