Prep the apples: Rinse well.
Core and slice thinly. Leave the peels on for more color and aroma.
Slice the ginger: Peel if you like, then cut into thin coins to release more flavor.
Add to pot: Place apples, ginger, and the cinnamon stick in a medium saucepan. Pour in 4–5 cups of water.
Simmer gently: Bring to a boil, then reduce to low.
Simmer uncovered for 20–30 minutes, until the apples are soft and the liquid smells fragrant.
Sweeten: Stir in sugar or honey a little at a time. Taste and adjust. If using lemon, add it now for brightness.
Strain or mash: For a clear tea, strain out solids.
For a fuller body, lightly mash the cooked apples, then strain.
Serve: Pour hot into mugs. Garnish with an apple slice or a cinnamon stick if you like.
Optional concentrate: For a stronger base, continue simmering 5–10 more minutes, then dilute with hot water when serving.