Fill an electric kettle with 1 1/2 cups of fresh water. Place the kettle on the stand and flip the toggle switch to the ON position.
Cut three of the lemons in half and cut the fourth into slices. Halve three of the slices to make six half-circles. Stud each half slice with three whole cloves.
Set out six heat-safe glasses. Squeeze the juice from half a lemon into each of the glasses, then top the lemon juice with one teaspoon of honey and an ounce of rum.
Once the kettle has finished boiling and the toggle switch returns to the OFF position, pour 1/4 cup of freshly boiled water into each glass. Stir until the honey has dissolved.
Garnish each glass with a clove-studded lemon slice and a cinnamon stick. Grate fresh nutmeg over the top. Serve immediately.
Notes
A Hot Rum Toddy is definitely best when it's freshly made, but if you have leftovers, you can keep them in an airtight container in the fridge for up to 2 days. To reheat, gently warm the toddy on the stove over low heat or in the microwave in short intervals, stirring occasionally. Avoid boiling to maintain the flavors and prevent overcooking the ingredients.