In a large saucepan put the sugar in a mound in the center of the pan, be sure it doesn’t hit the sides. Gently add the corn syrup and water, making sure the sugar doesn’t splash up on the sides of the pan. DO NOT STIR.
If any of the sugar is not dissolved, very gently drag your finger through the sugar until the water saturates it all, but make sure none of the sugar hits the sides of the pan. (All of this care to keep the sugar off the side of the pan will prevent your sugar from crystallizing while it cooks.)
Cook over high heat, without stirring. When the sugar starts to color on the edges, gently stir the sugar. Until it is quite dark, it will smoke a bit. I like my caramel very dark, with an almost bitter edge. Immediately distribute the caramel evenly into the prepared baking dish/es.
Place a pat of butter over the hot caramel. Add the spiraled apples.
Place the apple in the oven and immediately drop the temperature to 325°F. Bake until the apples are tender and the caramel seems to have saturated the apples. The baking time may vary depending on the apples and size of pan. I baked mine for about 1 hour.
Remove from oven and immediately flip the apples out onto a greased foil lined baking sheet.