Wash squash; remove seeds at full, round end; cut in ½″ slices. Overlap slices in 13 X 9 X 2″ baking pan. Sprinkle with salt and pepper to taste; dot with butter. Add water; cover tightly with foil.
Bake in hot oven (400°) 35 to 40 minutes, or until squash is tender. Serve topped with pecans.