In large bowl, mix melted butter, sage, salt and pepper. Add sweet potatoes, apples and onion; toss to coat. Using tongs or slotted spoon, transfer to pan in single layer. Add pork to bowl with mixture, and toss to coat. Add to pan with vegetables. Roast 23 to 27 minutes or until pork is no longer pink (145°F) and potatoes are fork-tender.