Two parts Stroh rum, one part port, one part strong infusion of tea, cinnamon, ginger, cloves and cardamom with honey.
Infusion can be made by boiling a load of cinnamon, ginger, cardamom and cloves in water with honey, bunging in a couple of big spoons of loose leaf tea at the end, off the heat and allowing to cool. Remove the bits by filtering or a fine tea strainer once cool.
Bottle the mix or carry in a flask and when needed fill a mug with it to about a third, squeeze of lemon juice and top up with boiling water.