Peel, core, and cut the apples into thick slices or wedges, and set aside.
Pour water into a large saucepan and stir in the sugar and cinnamon until the sugar begins to dissolve.
Bring the mixture to a gentle simmer over medium heat, releasing a warm cinnamon aroma as it heats.
Add the sliced apples to the simmering syrup, stacking them gently without stirring immediately, so they stay intact.
Reduce the heat to low, cover the pot, and let the apples simmer slowly, absorbing the cinnamon syrup until they are tender and slightly translucent, about 15 minutes.
Uncover the pot, and gently stir the apples with a wooden spoon, turning them to coat evenly in the syrup and encourage a saucy consistency.
Cook uncovered for another 2-3 minutes to thicken the syrup slightly and let the flavor meld.
Remove from heat and let the apples sit for a few minutes to settle and cool slightly.
Serve the simmered apples warm, spooned into bowls, with the fragrant syrup spooned over the top.