Slice up your onion, apple and pear.
Layer the sliced onions along the bottom of a crock-pot.
Sprinkle both sides of the pork tenderloin with salt and pepper and place over the onions.
Sprinkle the sage and rosemary over the pork. Drizzle the olive oil over the top.
Layer the sliced apples and pears over the pork.
Cover and cook on low for 8 hours.
When it is finished, slice up and serve with the apples and pears. Enjoy!