Peel the banana and cut in half lengthways. Melt the butter in a pan. Put in the banana halves and fry for 2-3 minutes on each side over medium heat. Mix the honey with the lemon juice and pour in.
Heat the milk in a saucepan, but do not let it boil. Coarsely mash the banana with a fork and add to the milk.
Mix well with the hand blender and pour into cups or glasses. Serve dusted with cinnamon.