Step 1 Melt the butter in a 12-inch cast-iron or heavy skillet over medium-high heat. Remove from the heat and sprinkle in the sugar. Stir until the butter is evenly mixed in.
Step 2 Working clockwise, tightly pack the apple wedges around the inside edge of the skillet, laying them on their sides. The apples will shrink as they cook, so don't hesitate to pack them tight. With the remaining apples, arrange them on their sides in the center of the skillet.
Step 3Cook the apples over high heat until the butter and sugar turn brown and caramelize, about 10 minutes. Turn off the heat and carefully turn the apples over to the uncooked side using 2 forks. Make sure that the apples are browned before you turn them over. Pack the apples tightly on their sides. If you see a loose area, rearrange the apples a bit to fill in the gap. Return to high heat and cook for another 5 minutes. Turn off the heat and let the apples cool in the skillet while you work on the dough.