Preheat oven to 400°. Cut acorn squash in half lengthwise; discard seeds. Cut each half into 6 wedges. Melt butter in a large ovenproof skillet over medium heat. Add squash; cook 3 minutes or until browned on one side. Turn wedges; sprinkle with salt. Place pan in oven; bake at 400° for 12 minutes or until tender.