In a glass or mug, combine the lemon juice, sugar lump, a clove studded lemon slice, strip of orange peel, and golden rum. Add boiling water to fill the mug and stir the drink with a cinnamon stick.
This is the type of soup that, at first glance, might seem a little…unexciting. But you’re underestimating the power of mushrooms, which do the heavy lifting.