Pour the apple cider into a medium pot and set it over low heat.
Add the sliced apples, cinnamon sticks, cloves, and ginger into the cider. Stir gently to distribute the spices evenly.
Increase the heat to medium-low and bring the mixture to a gentle simmer, allowing the spices to infuse the cider.
Let the cider simmer uncovered for about 20-30 minutes, occasionally stirring gently and watching for the fragrant steam rising from the pot.
Remove the cinnamon sticks, cloves, and ginger slices with tongs or a slotted spoon to prevent over-brewing.
Increase the heat slightly if needed, then ladle the hot cider into mugs, allowing the warm, spiced aroma to waft up as it fills the air.
Serve the cider hot, garnished with a fresh cinnamon stick or apple slice if desired for an extra touch of festivity.